JP3828288B2 - Information generating method and apparatus, information reproducing method and apparatus, and information recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field of an information generation apparatus and an information reproduction apparatus for preventing legitimately generated information from being illegally copied, illegally reproduced, and generally distributed.
[0002]
[Prior art]
In general, image information such as movies and audio information such as music are often protected by copyright, and in such cases, it is basically prohibited to copy such information without permission.
[0003]
In addition, it is necessary for the copyright holder to take measures to effectively prevent such copying.
[0004]
Here, as a conventional method for preventing illegal copying, a method of applying modulation called scramble to the image information is generally used. This scramble modulation is a modulation method that cannot be demodulated unless special key data is used. Normally, the key data is recorded in a data recording area of an optical disk or the like as recording information (data to be recorded) together with image information subjected to scramble modulation. Recorded and sold.
[0005]
In the user who purchased the optical disc, the key data recorded in the playback device of the optical disc owned by the user matches the key data recorded on the optical disc together with the image information and the like. Only when the scramble modulation of the image information or the like is demodulated by the key data, the image information or the like can be reproduced. At this time, if the user manages the key data so that others do not know it, even if only scrambled image information etc. is illegally copied, it cannot be demodulated and reproduced. It becomes.
[0006]
[Problems to be solved by the invention]
However, in the conventional illegal copy prevention method, since the key data is recorded in the data recording area of the optical disc or the like as scramble-modulated image information or the like, the key data is illegally copied together with the image information or the like. In this case, there is a problem in that it may be possible to demodulate and view image information using key data acquired by an illegally copied person.
[0007]
Furthermore, in the above-described conventional illegal copy prevention method, a technique for determining whether or not image information or the like is properly spread (that is, whether or not the image information or the like is a so-called “original”). Therefore, there is a problem that it is not possible to determine whether or not the illegally copied image information is illegally copied.
[0008]
Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that it is effective that illegally reproduced image information and the like that are normally generated are illegally reproduced and generally expanded. It is an object of the present invention to provide an information generation method and apparatus, an information reproduction method and apparatus, and an information recording medium that can be prevented.
[0009]
[Means for Solving the Problems]
  In order to solve the above-described problem, the invention according to claim 1 adds an error correction code used for error correction at the time of outputting the output information to the output information to be output, and outputs the correction code added output information. Identification information indicating that the output information is not an illegally copied part of the generated correction code additional output information.Rearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAnd a replacement step of generating replacement output information.
[0010]
  Therefore, a part of the generated correction code addition output information,Identification informationRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofFor example, when the generated replacement output information is recorded on an information recording medium and the output information is reproduced from the information recording medium.Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of output information (that is, illegally copied).
[0011]
  Furthermore, after adding the error correction code, a part of the correction code addition output information isRearrangementSince it is replaced with information, when playing the output information,Resequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0012]
  Therefore, in the information reproducing apparatus that can reproduce the output information only when the identification information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0013]
In order to solve the above-mentioned problem, the invention according to claim 2 is the information generation method according to claim 1, wherein the output information is not duplicated with respect to the output information. A sub-identification information adding step for adding identification information is further included, and in the addition step, the error correction code is added to the output information to which the sub-identification information is added, and the correction code-added output information is generated. In addition, the sub-identification information M and the identification information N are based on a preset function f,
[Expression 10]
M = f (N)
It is configured to be in the relationship.
[0014]
Therefore, the sub-identification information M and the identification information N are
## EQU11 ##
M = f (N)
For example, when the output information recorded on the information recording medium is reproduced, the output information is reproduced only when the identification information N and the sub-identification information M are both obtained. Even if either one of N or sub-identification information M is acquired by some illegal method, unless the function f is specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. Therefore, in the reproducing apparatus that reproduces the recorded output information, the illegally copied output information can be more effectively prevented from being reproduced.
[0015]
  In order to solve the above-mentioned problem, the invention according to claim 3 is the information generation method according to claim 1 or 2, wherein the error correction code includes a check symbol of an inner code such as an inner code of ECC and an ECC outside code. And a part of a portion where the inner code check symbol and the outer code check symbol overlap with each other in the replacement step.RearrangementConfigured to replace with information.
[0016]
  Therefore, a part of the portion where the check symbol of the inner code and the check symbol of the outer code overlapRearrangementFor example, when the output information recorded on the information recording medium is reproduced, there are an inner code check symbol and an outer code check symbol used for error correction of the output information itself.RearrangementThere is no replacement with information, and the error correction capability for the output information itself is not reduced.
[0017]
  In order to solve the above problems, the invention according to claim 4 is a correction code formed by adding an error correction code used for error correction at the time of reproduction of the recorded information to the recorded information to be recorded. Identification information indicating that a part of the additional recording information is not an illegal copy of the recording informationRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofThe replacement recording information formed by the replacement is recorded.
[0018]
  Therefore, part of the correction code-added recording information is used as identification information.Rearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofSince the replacement recording information formed by replacement is recorded, when reproducing the replacement recording information from the information recording medium,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0019]
  Also, some of the correction code-added recording information with the error correction code added isRearrangementSince it is replaced with information,Resequence information is extracted, therebyEven if the identification information is detected and the recorded information is played back,RearrangementThe information disappears due to error correction at the time of reproduction, and identification information is no longer recorded when the reproduced recording information is recorded on another information recording device.
[0020]
  Therefore, in the information reproducing apparatus that can reproduce the recorded information only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0021]
  In order to solve the above-described problem, the invention according to claim 5 is the information recording medium according to claim 4, wherein a part of the correction code-added recording information isRearrangementInformation and the relevant information in the replacement record informationRearrangementThe replacement generated by replacing with position information indicating the position of the informationRecordInformation is recorded and configured.
[0022]
  Therefore, in order to prevent illegal copying,RearrangementEven if the information replacement position has been changed, the position information is used as a clue.RearrangementSince information can be extracted,RearrangementBy changing the information replacement position, before error correction during playback of recorded informationRearrangementInformation can be prevented from being read illegally.
[0023]
In order to solve the above problems, the invention described in claim 6 is the information recording medium according to claim 4 or 5, wherein the identification information indicates in advance that the recorded information is not illegally copied. It is generated and configured by rearranging the codes constituting the set original identification information.
[0024]
  Therefore, since the identification information is generated by rearranging the codes constituting the original identification information indicating that it is not illegal copying, before error correction at the time of reproducing recorded informationRearrangementInformation is read, So identification information is detectedIn addition, the original original identification information can be prevented from being recognized.
[0025]
In order to solve the above-mentioned problem, the invention according to claim 7 is the information recording medium according to claim 6, wherein the identification information includes a plurality of error correction units that are correction units in the error correction. It is generated by rearranging the codes in the original identification information corresponding to the error correction unit at a time.
[0026]
Therefore, since the rearrangement is performed over a plurality of error correction units, the leakage of the identification information can be more effectively prevented when the recorded information is reproduced.
[0027]
  In order to solve the above-described problem, the invention according to claim 8 is the information recording medium according to any one of claims 4 to 7, wherein a plurality of error correction units which are correction units in the error correction are provided. One of the above error correction unitsRearrangementPart of the correction code-added recording information is included so that the information is included.RearrangementThe replacement record information generated by replacement with information is recorded.
[0028]
  Therefore, it is the same across multiple error correction units.RearrangementSince information is included, the leakage of identification information can be more effectively prevented when recording information is recorded.
[0029]
In order to solve the above-described problem, the invention according to claim 9 is the information recording medium according to any one of claims 4 to 8, wherein the error correction is performed by different encryption processes corresponding to encryption times. The recording information before the addition of the code is encrypted, and the identification information includes generation information indicating the content of the encryption processing in the encryption and the encryption time.
[0030]
Therefore, since the contents of the encryption process and the encryption time are included in the generation information, when reproducing the recorded information, the contents of the decryption process that breaks the encryption according to the encryption time is the contents of each encryption process. If selected for each, even if the content of one encryption process leaks at the time of the output, the output information encrypted using the content of another encryption process can be decrypted, and illegal copying can be effectively prevented. .
[0031]
In order to solve the above-described problem, the invention according to claim 10 is the information recording medium according to claim 9, wherein the identification information includes encryption key information used for the encryption processing. ing.
[0032]
Therefore, if the identification information cannot be acquired during reproduction, the encrypted output information cannot be decrypted, so that illegal copying can be effectively prevented.
[0033]
In order to solve the above-described problem, the invention according to claim 11 is the information recording medium according to claim 10, wherein the identification is performed after the encryption key information is encrypted by a preset encryption process. Inserted into the information.
[0034]
Therefore, since the encryption key for encryption is further encrypted, it becomes more difficult to decrypt the encrypted record information.
[0037]
  To solve the above problems, the claims12The invention described in claim 4 is from11In the information recording medium according to any one of the above, sub-identification information indicating that the recording information is not illegally copied is added in advance to the recording information, and the correction code-added recording information Is formed by adding the error correction code to the recording information to which the sub-identification information is added, and the sub-identification information M and the identification information N are set to a preset function f. On the basis of the,
[Expression 12]
  M = f (N)
  It is configured to be in the relationship.
[0038]
Therefore, the sub-identification information M and the identification information N are based on a preset function f,
[Formula 13]
M = f (N)
Therefore, if the recording information is reproduced only when the identification information N and the sub-identification information M are obtained together when reproducing the recording information from the information recording medium, the identification information N or the sub-information is reproduced. Even if either one of the identification information M is acquired by any illegal method, unless the function f is specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. In a reproducing apparatus that reproduces information, the illegally copied recorded information can be more effectively prevented from being reproduced.
[0039]
  To solve the above problems, the claims13The invention described in claim 4 is from12In the information recording medium according to any one of the above, the error correction code includes an inner code check symbol such as an ECC inner code and an outer code check symbol such as an ECC outer code, and the inner code. A part of a portion where the check symbol of the outer code and the check symbol of the outer code overlapRearrangementIt is configured to be recorded by being replaced with information.
[0040]
  Therefore, part of the part where the check symbol of the inner code and the check symbol of the outer code overlapRearrangementSince it is recorded after being replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementThe information is not replaced, and the error correction capability for the recorded information itself is not lowered.
[0041]
  To solve the above problems, the claims14In the invention described in the above, a part of the correction code-added recording information formed by adding an error correction code used for error correction at the time of reproducing the recording information to the recording information to be recorded is recorded in the recording information. Identification information indicating that it was not illegally copiedRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAn information reproducing method for reproducing the recording information from an information recording medium such as a DVD in which replacement recording information formed by replacing the recording information is detected, and a detection step of detecting the replacement recording information from the information recording medium; From the detected replacement record information,RearrangementAn extraction process for extracting information;Obtain the amount of movement of the sequence of the rearrangement information necessary for obtaining the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementThe identification information isGetA determination step of determining whether or not the identification information isGetA reproduction step of performing error correction on the replacement recording information using the error correction code only when it is performed, and reproducing the recording information.
[0042]
  Therefore,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementSince it can be played back only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0043]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0044]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0045]
  To solve the above problems, the claims15In the invention described in the above, a part of the correction code-added recording information formed by adding an error correction code used for error correction at the time of reproducing the recording information to the recording information to be recorded is recorded in the recording information. Identification information indicating that it was not illegally copiedRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAn information reproducing method for reproducing the recording information from an information recording medium such as a DVD in which replacement recording information formed by replacing the recording information is detected, and a detection step of detecting the replacement recording information from the information recording medium; From the detected replacement record information,RearrangementAn extraction process for extracting information;Obtain the amount of movement of the sequence of the rearrangement information necessary for obtaining the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementThe identification information isGetA determination step of determining whether or not the error has been made, an error correction step of performing error correction on the detected replacement recording information using the error correction code, and the identification informationGetA reproducing step of reproducing the recording information based on the error-corrected replacement recording information only when the recording information is corrected.
[0046]
  Therefore,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementSince it can be played back only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0047]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0048]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0049]
  To solve the above problems, the claims16The invention described in claim14Or15In the information reproduction method according to any one of the above, sub-identification information indicating that the recording information is not illegally copied is added in advance to the recording information, and the correction code-added recording information Is formed by adding the error correction code to the recording information to which the sub-identification information is added, and the sub-identification information M and the identification information N are set to a preset function f. On the basis of the,
[Expression 14]
  M = f (N)
  In the extraction step, the identification information and the sub-identification information are extracted from the replacement record information in the extraction step, whether or not the identification information is extracted in the determination step, and the identification information N and the sub-identification information Based on the function f, the relationship with the identification information M is
[Expression 15]
  M = f (N)
  In the reproduction step, the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is
[Expression 16]
  M = f (N)
  The recorded information is reproduced only when the relationship is satisfied.
[0050]
Therefore, in the reproduction process, the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is
[Expression 17]
M = f (N)
Since the recorded information is reproduced only when there is a relationship, even if either one of the identification information N or the sub-identification information M is obtained by any illegal method, the other information (sub-identification) is used as long as the function f is not specified. Thus, the information M or the identification information N) cannot be obtained correctly. Therefore, it is possible to more effectively prevent the illegally copied recorded information from being reproduced during information reproduction.
[0051]
  To solve the above problems, the claims17The invention described in claim14From16In the information reproduction method according to any one of the above, the error correction code includes an inner code check symbol such as an ECC inner code and an outer code check symbol such as an ECC outer code, and the inner code. A part of a portion where the check symbol of the outer code and the check symbol of the outer code overlapRearrangementIt is constructed by replacing information.
[0052]
  Therefore, part of the part where the check symbol of the inner code and the check symbol of the outer code overlapRearrangementSince it is replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementIt is not replaced with information, and therefore the error correction capability for the recorded information itself does not deteriorate.
[0053]
  To solve the above problems, the claims18The invention described in 1) adds an error correction code used for error correction at the time of outputting the output information to the output information to be output, and an adding means such as an ECC encoder for generating correction code additional output information; Identification information indicating that a part of the generated correction code-added output information is not an illegal copy of the output informationRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAnd replacement means such as an identification information writer for generating replacement output information.
[0054]
  Therefore, a part of the generated correction code addition output information,Identification informationRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofFor example, when the generated replacement output information is recorded on an information recording medium and the output information is reproduced from the information recording medium.Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of output information (that is, illegally copied).
[0055]
  Furthermore, after adding the error correction code, a part of the correction code addition output information isRearrangementWhen replacing recorded information,Resequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0056]
  Therefore, in the information reproducing apparatus that can reproduce the output information only when the identification information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0057]
  To solve the above problems, the claims19The invention described in claim18In the information generation device according to claim 1, the replacement unit converts a part of the generated correction code-added output information into the information.RearrangementInformation and the replacement output informationRearrangementIt replaces with the positional information which shows the position of information, and it is comprised so that the said replacement output information may be produced | generated.
[0058]
  Therefore, in order to prevent illegal copying,RearrangementEven if the information replacement position is changed, the position information is used as a clue.RearrangementSince information can be extracted,RearrangementBy changing the information replacement position, before error correctionRearrangementInformation can be prevented from being read illegally.
[0059]
  To solve the above problems, the claims20The invention described in claim18Or19In the information generating apparatus described in 1), a rearrangement unit or the like that rearranges each code constituting the preset original identification information indicating that the output information is not illegally copied to generate the identification information And the replacement means replaces part of the generated correction code-added recording information with the generated identification information.Rearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAnd the replacement output information is generated.
[0060]
  Therefore, it is generated by rearranging the codes that make up the original identification information indicating that the identification information is not illegal copying.RearrangementInformation is read, So identification information is detectedIn addition, the original original identification information can be prevented from being recognized.
[0061]
  To solve the above problems, the claims21The invention described in claim20In the information generating apparatus described in the above, the rearranging unit rearranges the codes in the original identification information corresponding to a plurality of error correction units at a time with respect to an error correction unit that is a correction unit in the error correction. It is configured to generate identification information.
[0062]
  Therefore, since rearrangement is performed over a plurality of error correction units, leakage of identification information can be more effectively prevented when output information is output.
[0063]
  To solve the above problems, the claims22The invention described in claim18From21In the information generation apparatus according to any one of the above, the replacement unit includes the error correction unit, which is a correction unit in the error correction, over a plurality of the error correction units.RearrangementPart of the correction code added output information so that the information is included.RearrangementConfigured to replace with information.
[0064]
  Therefore, it is the same across multiple error correction units.RearrangementSince the information is included, the leakage of the identification information can be more effectively prevented when outputting the output information.
[0065]
  To solve the above problems, the claims23The invention described in claim18From22In the information generation device according to any one of the above, an encryption unit such as a data generator that encrypts the output information before addition of the error correction code by different encryption processing corresponding to the encryption time is further provided. In addition, the identification information is configured to include generation information indicating the content of the encryption process in the encryption unit and the encryption time.
[0066]
Therefore, since the contents of the encryption process and the encryption time are included in the generation information, when outputting the output information, the contents of the decryption process that breaks the encryption according to the encryption time is the contents of each encryption process. If selected for each, even if the content of one encryption process leaks at the time of the output, the output information encrypted using the content of another encryption process can be decrypted, and illegal copying can be effectively prevented. .
[0067]
  To solve the above problems, the claims24The invention described in claim23In the information generating apparatus described in (1), the identification information includes encryption key information used for encryption processing in the encryption means.
[0068]
Therefore, if the identification information cannot be acquired, the encrypted output information cannot be decrypted, so that illegal copying can be effectively prevented.
[0069]
  To solve the above problems, the claims25The invention described in claim24The information generation apparatus according to claim 1, further comprising: an encryption insertion unit such as an encryption unit that inserts the encryption key information into the identification information after encrypting the encryption key information by a preset encryption process.
[0070]
Therefore, since the encryption key for encryption is further encrypted, it becomes more difficult to decrypt the encrypted output information.
[0073]
  To solve the above problems, the claims26The invention described in claim18From25The information generation apparatus according to any one of claims 1 to 4, further comprising sub-identification information adding means for adding sub-identification information indicating that the output information is not illegally copied to the output information. The means adds the error correction code to the output information to which the sub-identification information is added, generates the correction code-added output information, and the sub-identification information M and the identification information N are preliminarily stored. Based on the set function f,
[Formula 18]
  M = f (N)
  It is configured to be in the relationship.
[0074]
Therefore, the sub-identification information M and the identification information N are based on the function f,
[Equation 19]
M = f (N)
For example, when the output information recorded on the information recording medium is reproduced, the output information is reproduced only when the identification information N and the sub-identification information M are both obtained. Even if either one of N or sub-identification information M is acquired by some illegal method, unless the function f is specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. Therefore, in the reproducing apparatus for the recorded output information, it is possible to more effectively prevent the illegally copied output information from being reproduced.
[0075]
  In order to solve the above-mentioned problems, the claims27The invention described in claim18From26In the information generating apparatus according to any one of the above, the error correction code is configured by a check symbol of an inner code such as an ECC inner code and a check symbol of an outer code such as an ECC outer code, and the replacement unit. Is a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap.RearrangementConfigured to replace with information.
[0076]
  Therefore, the replacement means replaces a part of the overlapping portion between the inner code check symbol and the outer code check symbol.RearrangementFor example, when the output information recorded on the information recording medium is reproduced, there are an inner code check symbol and an outer code check symbol used for error correction of the output information itself.RearrangementThere is no replacement with information, and the error correction capability for the output information itself is not reduced.
  In order to solve the above problems, the invention according to claim 28 is a correction code formed by adding an error correction code used for error correction at the time of reproduction of the recorded information to the recorded information to be recorded. Rearrangement information generated by moving a part of the additional recording information by an amount corresponding to the value of the identification information indicating that the recording information is not illegally copied. An information reproducing apparatus for reproducing the recording information from an information recording medium such as a DVD in which replacement recording information formed by replacement is recorded, and an optical pickup for detecting the replacement recording information from the information recording medium Detecting means, an extracting means such as an identification information extracting circuit for extracting the rearrangement information from the detected replacement record information, and moving the array from the extracted rearrangement information. A determination unit such as a CPU for determining a movement amount of the rearrangement information array necessary for obtaining the previous data and determining whether the identification information is acquired based on the movement amount; and the identification information Reproduction means such as a demodulation circuit for performing error correction on the replacement recording information using the error correction code only when it is acquired, and reproducing the recording information.
  Therefore, the amount of movement of the sequence of the rearrangement information necessary for obtaining the data before moving the sequence from the extracted rearrangement information is obtained, and can be reproduced only when the identification information is detected based on the amount of movement. Therefore, illegal reproduction of recorded information in which identification information is not detected (that is, illegally copied) can be prevented.
In addition, since a part of the correction code addition recording information after the error correction code is added is replaced with the rearrangement information, the rearrangement information disappears due to error correction at the time of reproduction, and the reproduced recording is performed. The reordering information is no longer recorded when the information is recorded on another information recording device.
Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0077]
  To solve the above problems, the claims29In the invention described in the above, a part of the correction code-added recording information formed by adding an error correction code used for error correction at the time of reproducing the recording information to the recording information to be recorded is recorded in the recording information. Identification information indicating that it was not illegally copiedRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofAn information reproducing apparatus for reproducing the recording information from an information recording medium such as a DVD in which replacement recording information formed by replacement is recorded, and an optical pickup for detecting the replacement recording information from the information recording medium Detection means and the detected replacement record informationRearrangementAn extraction means such as an identification information extraction circuit for extracting information;Obtain the amount of movement of the sequence of the rearrangement information necessary for obtaining the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementThe identification information isGetDetermination means such as a CPU for determining whether or not the error has been made, error correction means such as an error correction circuit for performing error correction on the detected replacement recording information using the error correction code, and the identification informationGetReproduction means such as a demodulation circuit that reproduces the recording information based on the error-corrected replacement recording information only when the error information is corrected.
[0078]
  Therefore,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIdentification informationdetectionSince the recorded information is reproduced based on the replacement recorded information whose error is corrected only when the identification information is detected, it can be reproduced only when the identification information is detected.Not detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0079]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0080]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0081]
  To solve the above problems, the claims30The invention described in claim28 or 29In the information reproducing apparatus according to claim 1, sub-identification information indicating that the recording information is not illegally copied is added in advance to the recording information, and the correction code-added recording information is further added to the sub-identification. The sub-identification information M and the identification information N are formed by adding the error correction code to the recording information to which the information is added, based on a preset function f,
[Expression 20]
  M = f (N)
  The extraction means extracts the identification information and the sub-identification information from the replacement record information, and the determination means determines whether the identification information has been extracted, and the identification information N and the sub-identification information. Based on the function f, the relationship with the identification information M is
[Expression 21]
  M = f (N)
  The reproducing means extracts the identification information, and the relationship between the identification information N and the sub-identification information M is
[Expression 22]
  M = f (N)
  The recorded information is reproduced only when the relationship is satisfied.
[0082]
Therefore, the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is
[Expression 23]
M = f (N)
Since the recorded information is reproduced only when the relationship is the above, the recorded information is reproduced only when the identification information N and the sub-identification information M are obtained, so that either the identification information N or the sub-identification information M is Even if the information is obtained by any illegal method, the other information (sub-identification information M or identification information N) cannot be obtained correctly unless the function f is specified. It is possible to more effectively prevent the recorded information that has been recorded from being reproduced.
[0083]
  To solve the above problems, the claims31The invention described in claimAny one of 28 to 30In the information reproducing apparatus described in (1), the error correction code includes an inner code check symbol such as an ECC inner code and an outer code check symbol such as an ECC outer code, and the inner code check symbol and the inner code check symbol Part of the overlap with the check symbol of the outer code is the frontRearrangementIt is configured by being replaced with other information.
[0084]
  Therefore, part of the part where the check symbol of the inner code and the check symbol of the outer code overlapRearrangementSince it is replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementIt is not replaced with information, and therefore the error correction capability for the recorded information itself does not deteriorate.
[0085]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings. In the embodiment described below, information recording is performed for recording information on a DVD (an optical disk having a recording capacity increased by about 7 times or more compared to a conventional CD (Compact Disk)), which is a kind of optical disk. The present invention relates to an illegal copying prevention system including an apparatus (more specifically, a cutting apparatus for manufacturing a stamper disk used for mass production of DVD) and an information reproducing apparatus for reproducing information from the DVD. This is an embodiment when applied.
[0086]
(I)First embodiment of illegal copy prevention system
First, a first embodiment of an illegal copy prevention system according to the present invention will be described with reference to FIGS.
[0087]
(A)First embodiment of cutting apparatus
First, an embodiment of the cutting device according to a first embodiment (hereinafter simply referred to as the first embodiment) of an illegal copy prevention system will be described with reference to FIGS.
[0088]
First, the structure of the cutting device of 1st Embodiment is demonstrated using FIG.
[0089]
As shown in FIG. 1, a cutting apparatus C according to the first embodiment includes a data generator 1 as an encryption unit, an ECC (Error Correcting Code) encoder 2 as an addition unit, and identification information writing as a replacement unit. 3, encoder 4, laser generator 5, optical modulator 6, objective lens 7, spindle motor 13, rotation detector 9, rotation servo circuit 8, feed unit 12, position detector 11 and a feed servo circuit 10.
[0090]
The stamper disk SP is composed of a resist 14 and a glass substrate 15. Here, the resist 14 is sensitized by irradiation with a light beam B described later, and pits having a shape corresponding to a change in the intensity of the light beam B are formed.
[0091]
Next, an outline operation will be described.
[0092]
The data generator 1 performs data sector generation processing, which will be described later, on data to be recorded as a DVD (image information, audio information, data to be used by a computer, etc.), and outputs the data signal Sd to the ECC encoder 2 To do.
[0093]
Then, the ECC encoder 2 forms an ECC block, which will be described later, on the data to be recorded included in the data signal Sd, and outputs it to the identification information writer 3 as an additional data signal Sde.
[0094]
Next, the identification information writer 3 determines that a part of the ECC block included in the additional data signal Sde is identification information described later (data recorded on the DVD is legitimate (that is, not illegal copy) data). The replacement data signal Sdr is generated.
[0095]
Then, the encoder 4 performs interleaving and 8-16 modulation on the ECC block included in the replacement data signal Sdr to generate a recording data signal Sr.
[0096]
On the other hand, the laser generator 5 emits a light beam B for forming pits as DVDs on the stamper disk SP.
[0097]
The optical modulator 6 modulates the intensity of the light beam B generated by the laser generator 5 using the recording data signal Sr.
[0098]
Next, the objective lens 7 focuses the intensity-modulated light beam B on the resist 14 of the stamper disk SP.
[0099]
At this time, the spindle motor 13 rotates the stamper disk SP.
[0100]
The rotation detector 9 detects the rotation speed of the stamper disk SP.
[0101]
Thereby, the rotation servo circuit 8 servo-controls the rotation of the stamper disk SP based on the detected number of rotations.
[0102]
Further, the feed unit 12 sets the spindle motor 13 and the stamper disk SP in correspondence with the rotation of the stamper disk SP in order to form a spiral track having the pits arranged in a row on the stamper disk SP. The stamper disk SP is moved in the radial direction.
[0103]
At this time, the position detector 11 detects the position of the feed unit 12.
[0104]
The feed servo circuit 10 servo-controls the movement of the feed unit 12 based on the detected position of the feed unit 12.
[0105]
By the above operation, pits corresponding to the recording data signal Sr are formed on the resist 14 of the stamper disk SP by forming a spiral track, and the stamper disk SP as a die for DVD manufacture is completed.
[0106]
Thereafter, a so-called replication process such as resin molding, reflection film formation, protective layer formation, etc. is performed using the stamper disk SP, and mass production of a DVD as a replica disk having pits corresponding to the recording data signal Sr is performed. Is done.
[0107]
Next, the detailed operation of generating the recording data signal Sr according to the present invention will be described with reference to FIGS. FIG. 2 is a flowchart showing the operation, and FIGS. 3 to 5 are diagrams showing the structure of data (data included in the recording data signal Sr) generated by the operation.
[0108]
When the recording data signal Sr is generated in the cutting apparatus C of the first embodiment, first, the structure of the original data to be recorded is changed to a structure including a plurality of information units called data sectors.
[0109]
That is, as shown in FIG. 2, first, the original data to be recorded is divided into 2048-byte data, and for each divided data, ID information indicating the start position of the data sector, and the ID information An ID information error correction code (IEC (ID Data Error correction Code)) for correcting an error is added (step S1).
[0110]
Next, an error detection code (EDC (Error Detection Code)) for detecting an error in the spare data and the divided 2048-byte data is added to the data generated in step S1, thereby One data sector is formed (step S2).
[0111]
A specific configuration of this data sector will be described. As shown in FIG. 3A, from the head of one data sector 20, ID information 21, ID information error correction code 22, spare data 23, and the above Data 24 divided from the original data and an error detection code 25 are formed. Data to be recorded is configured by a plurality of data sectors 20 being continuous.
[0112]
When the data sector 20 is formed, the data 24 portion is then scrambled using predetermined key data (step S3).
[0113]
The processes of steps S1 to S3 described above are executed in the data generator 1 and the data signal Sd including the scrambled data 24 is output. The key data used for scrambling is recorded as data 24 together with other image information.
[0114]
Next, the ECC encoder 2 uses the data sector 20 included in the data signal Sd to generate an ECC block that is a correction unit in error correction performed when data recorded on the DVD is reproduced. The additional data signal Sde including the block is output to the identification information writer 3 (step S4).
[0115]
This ECC block generation process will be described in more detail. As shown in FIG. 3B, first, one data sector 20 is divided into 172 bytes, and each divided data (hereinafter referred to as “data sector 20”) Data blocks 33) are arranged in the vertical direction (see the left figure in FIG. 3B). At this time, 12 rows of data blocks 33 are arranged in the vertical direction.
[0116]
Each of the data blocks 33 arranged in the vertical direction is also referred to as a 10-byte ECC code (PI (Parity In) code), which is an error correction code for correcting data for one horizontal line in the ECC block. 31) is added to the end of the data block 33 to constitute one correction block 34 (see the right figure in FIG. 3B). At this stage, the correction blocks 34 to which the ECC code 31 is added are arranged in 12 rows in the vertical direction. Thereafter, this process is repeated for 16 data sectors 20 minutes. As a result, a correction block 34 of 192 rows is obtained.
[0117]
Next, with the correction blocks 34 of the 192 rows arranged in the vertical direction, the correction block 34 of the 192 rows is divided in the vertical direction from the beginning for each byte, and each divided data is divided. On the other hand, 16 ECC outer codes (also referred to as PO (Parity Out) codes, which are error correction codes for correcting one column of data in the ECC block) 32 are added. Note that the ECC outer code 32 is also added to the portion of the ECC code 31 in the correction block 34.
[0118]
Through the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in the right diagram of FIG. 3B, and the additional data signal Sde including the ECC block 30 is sent to the identification information writer 3. Is output.
[0119]
At this time, the total amount of information included in one ECC block 30 is
[Expression 24]
(172 + 10) bytes × (192 + 16) rows = 37856 bytes
Of these, the actual data 24 is
[Expression 25]
2048 bytes x 16 = 32768 bytes
It becomes.
[0120]
In the ECC block 30 shown in the right diagram of FIG. 3B, 1-byte data is indicated by “D #. *”. For example, “D1.0” indicates 1-byte data arranged in the first row and 0th column, and “D190.170” indicates 1-byte data arranged in the 190th row and 170th column. Show. Accordingly, the ECC inner code 31 is arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.
[0121]
Further, one correction block 34 is continuously recorded on the DVD (on the stamper disk SP).
[0122]
Here, as shown in the right diagram of FIG. 3B, the ECC block 30 is configured to include both the ECC inner code 31 and the ECC outer code 32 in the horizontal direction in the right diagram of FIG. This is because correction of arranged data is performed by the ECC inner code 31 and correction of data arranged in the vertical direction in the right diagram of FIG.
[0123]
That is, in the ECC block 30 shown in the right figure of FIG. 3B, it becomes possible to perform error correction in the horizontal and vertical directions, compared with the error correction processing used in the conventional CD or the like. Therefore, it is configured to perform error correction more powerfully.
[0124]
More specifically, for example, one correction block 34 (which is composed of a total of 182 bytes of data including the ECC code 31 for one row as described above, and is continuously recorded on the DVD. Even if all of them are destroyed by a scratch on the DVD, when viewed from the vertical direction, only one byte of data is destroyed for one ECC outer code 32. Therefore, if error correction is performed using the ECC outer code 32 of each column, even if all of one correction block 34 is destroyed, correct error correction can be performed and reproduction can be performed accurately.
[0125]
Next, in the identification information writer 3, a part of the ECC block 30 generated as described above is not the data recorded by the cutting device C is legitimate (original) data and illegally copied. It replaces with the identification information which shows that there is no (step S5).
[0126]
This replacement process will be described with reference to FIG. 4. In the first embodiment, a portion of the ECC block 30 in which the ECC inner code 31 and the ECC outer code 32 overlap (in one ECC block 30, the lower right portion thereof). 12 bytes downward from the upper left end of the image (that is, in the ECC block 30, from the 192nd row and the 172nd column to the 203rd row and the 172nd column) the identification information 35 (an image generally called a watermark) It is not the identification information superimposed inside, but the identification information superimposed as data other than the image.)
[0127]
Note that the position in the ECC block 30 where the identification information 35 is inserted is stored in a (regular) information reproducing apparatus (described later) that should reproduce the data after being recorded on the DVD.
[0128]
When the identification information 35 is written in step S5, the replacement data signal Sdr constituted by the ECC block 30 'including the identification information 35 is output to the encoder 4.
[0129]
Next, in the encoder 4, the ECC block 30 'included in the replacement data signal Sdr is interleaved and 8-16 modulated, and the recording data signal Sr is output (steps S6 and S7).
[0130]
The processing in steps S6 and S7 will be specifically described with reference to FIG. In FIG. 5, the data indicated by “D #. *” Corresponds to the data described in the right diagram of FIG.
[0131]
First, when interleaving is performed on the ECC block 30 ′ in step S <b> 6, first, as shown in the uppermost stage in FIG. 5, the ECC blocks 30 ′ are arranged in a row in the horizontal direction for each correction block 34. Interleaving is performed by rearranging the arranged data according to a certain rule, and information for the ECC block 30 'is divided into 16 recording sectors 40. At this time, one recording sector 40 includes 2366 bytes (37856 bytes ÷ 16) of information, and in this, the data sector 20, the ECC inner code 31 or the outer ECC code 32, and the identification information 35 are mixed. ing. However, ID information 21 (see FIG. 3A) in the data sector 20 is arranged at the head of each recording sector 40.
[0132]
One recording sector 40 is divided into data 41 for every 91 bytes, and a header H is added to each. Thereafter, the recording sector 40 in this state is subjected to 8-16 modulation, whereby one sync frame 42 is formed for each data 41. At this time, one sync frame 42 includes a header H ′ and data 43. The amount of information in one sync frame 42 is
[Equation 26]
91 bytes x 8 x (16/8) = 1456 bytes
Thus, information is written on the DVD in a form in which the sync frames 42 are continuous. At this time, one recording sector 40 includes 26 sync frames 42.
[0133]
By configuring the format described above and recording data on a DVD (stamper disk SP), when the data is reproduced, 8-16 demodulation and deinterleaving are performed (see FIG. 5). The block 30 'can be restored, and the information can be accurately reproduced by performing strong error correction as described above.
[0134]
(B)Embodiment of information reproducing apparatus
Next, an embodiment of the information reproducing apparatus of the first embodiment for reproducing the data on the DVD manufactured using the stamper disk SP on which the data is recorded by the cutting apparatus C will be described with reference to FIGS. Will be described. The information reproducing apparatus described below is an information reproducing apparatus having a function of reproducing image information and audio information when both image information and audio information are recorded as data on a DVD.
[0135]
First, the configuration of the information reproducing apparatus according to the first embodiment will be described with reference to FIG.
[0136]
As shown in FIG. 6, the information reproducing apparatus S according to the first embodiment includes an optical pickup 51 as a detection unit, an RF (Radio Frequency) amplifier 52, an error correction circuit 53 as an error correction unit, and a spindle driver 54. A spindle motor 55, a video circuit 56 as playback means, an audio circuit 57 as playback means, a CPU 58 as determination means, an operation panel 59, a RAM (Random Access Memory) 60, and a servo circuit 61 , A focus driver 62, a tracking driver 63, a demodulating circuit 64 as reproducing means, an identification information extracting circuit 65 as extracting means, and a display unit 66.
[0137]
Next, an outline operation will be described.
[0138]
The DVD 50 manufactured using the above-described stamper disk SP is placed on a turntable (not shown) and rotated by a spindle motor 55.
[0139]
The optical pickup 51 irradiates the rotating DVD 50 with the light beam B for information reproduction, generates a detection signal Sp corresponding to the pit formed on the DVD 50 based on the reflected light, and generates an RF amplifier. To 52.
[0140]
Then, the RF amplifier 52 irradiates the DVD 50 with the RF signal Srf corresponding to the data recorded on the DVD 50 and the light beam B on the information recording surface of the DVD 50 based on the input detection signal Sp. A tracking error signal Ste indicating the deviation of the position of the formed light spot from the track formed by the pits on the DVD 50, and a focus error signal Sfe indicating the deviation of the focal position of the light beam B from the information recording surface, And the RF signal Srf is output to the demodulating circuit 64 and the tracking error signal Ste and the focus error signal Sfe are output to the servo circuit 61.
[0141]
Accordingly, the servo circuit 61 focuses the light beam B on the information recording surface of the DVD 50 based on the tracking error signal Ste so that the position of the light spot coincides with the position of the track under the control of the CPU 58. A tracking drive signal Std for servo-driving an objective lens (not shown) in a direction parallel to the information recording surface is generated and output to the tracking driver 63.
[0142]
In parallel with this, the servo circuit 61 controls the objective lens based on the focus error signal Sfe so that the converging position of the light beam B coincides with the information recording surface of the DVD 50 under the control of the CPU 58. A focus drive signal Sfd for servo driving in a direction perpendicular to the recording surface is generated and output to the focus driver 62.
[0143]
Then, the tracking driver 63 and the focus driver 62 respectively perform processing such as amplification on the tracking drive signal Std or the focus drive signal Sfd, and output it to an actuator (not shown) in the optical pickup 51 to drive it. Servo-control the position of the light spot and the condensing position of the light beam B.
[0144]
On the other hand, the demodulation circuit 64 to which the RF signal Srf is input performs deinterleaving and 8-16 demodulation (see FIG. 5) on the RF signal Srf, generates a reproduction signal Se, and sends it to the identification information extraction circuit 65. Output.
[0145]
Next, as will be described later, the identification information extraction circuit 65 includes a part of the data that includes the identification information 35 from the reproduction signal Se (the identification information 35 is included in one ECC block). The data of the determined position) is extracted and output to the CPU 58 as the identification information signal Sw, and the input reproduction signal Se is output to the error correction circuit 53 as it is.
[0146]
Then, under the control of the CPU 58, the error correction circuit 53 performs error correction processing using the ECC code 31 and the ECC outer code 32 for the ECC block 30 ′ included in the input reproduction signal Se. In addition, the error-corrected data is separated into image information and audio information, an image signal including the image information is output to the video circuit 56, and an audio signal including the audio information is output to the audio circuit 57.
[0147]
As a result, the video circuit 56 restores the input image signal to the original image, and outputs and displays it on a monitor (not shown). The audio circuit 57 restores the input audio signal to the original audio and outputs it to a speaker (not shown).
[0148]
On the other hand, the error correction circuit 53 detects the phase difference between the phase of the reproduction signal Se and the phase of the preset reference reproduction clock signal in parallel with the error correction processing described above, and uses the phase difference signal as a spindle driver. To 54. Then, the spindle driver 54 servo-controls the rotation speed of the spindle motor 55 based on the phase difference signal.
[0149]
Note that the CPU 58 performs control processing for the entire information reproducing apparatus S in addition to the control processing for each component described above. At this time, information necessary for the control process is input from the outside via the operation panel 59.
[0150]
Further, information necessary for the control process is temporarily stored in the RAM 60 and read out to the CPU 58 as necessary.
[0151]
Further, the operating state and the like of the information reproducing apparatus S are displayed on the display unit 66 such as a liquid crystal display as necessary.
[0152]
Next, the reproducing operation of data recorded on the DVD 50 according to the present invention will be described with reference to FIGS. FIG. 7 is a flowchart showing the reproduction operation.
[0153]
In the reproduction operation, as shown in FIG. 7, the DVD 50 is first irradiated with the light beam B from the optical pickup 51, and the data recorded on the DVD 50 is reproduced using the reflected light (step S10). . At this time, the focus error signal Sfe and the tracking error signal Ste described above are generated by the RF amplifier 52 and output to the servo circuit 61, and the RF signal Srf is generated and output to the demodulation circuit 64.
[0154]
Next, in the demodulation circuit 64, the RF signal Srf is deinterleaved and 8-16 demodulated (step S11), and the reproduction signal Se is generated.
[0155]
At the stage of the reproduction signal Se, the data detected from the DVD 50 is in a state in which a plurality of ECC blocks 30 'shown in FIG. 4 are included by deinterleaving and 8-16 demodulation.
[0156]
Next, in the identification information extraction circuit 65, an area in which the identification information 35 is recorded in the ECC block 30 ′ in the reproduction signal Se (replicated using the stamper disk SP manufactured by the cutting device C). In the case of the DVD 50, from the 192nd and 172nd columns to the 203rd and 172nd columns in one ECC block 30 ', the fact that the identification information 35 is included in this area is stored in the CPU 58 in advance. ) Is detected and output to the CPU 58 as the identification information signal Sw (step S12).
[0157]
In parallel with this, the identification information extraction circuit 65 outputs the input reproduction signal Se to the error correction circuit 53 as it is.
[0158]
Next, the CPU 58 confirms the content of the data included in the input identification information signal Sw (step S13), and whether or not the data is the identification information 35, that is, the reproduced ECC block. It is determined whether or not the identification information 35 is included in 30 '(step S14).
[0159]
If it is determined in step S14 that the data included in the identification information signal Sw is the identification information 35 (step S14; yes), the data recorded on the DVD 50 is properly (originally) recorded. Assuming that the data is data that has not been illegally copied, the error correction circuit 53 then converts the data included in the reproduction signal Se into the ECC code 31 in the ECC block 30 ′ under the control of the CPU 58. Then, error correction is performed using the ECC outer code 32, and the image signal to be output to the video circuit 56 and the audio signal to be output to the audio circuit 57 are generated (step S15).
[0160]
The identification information 35 in the ECC block 30 'disappears from the reproduced data because it is handled and corrected as an error in the error correction in the error correction circuit 53. This is because the identification information 35 is obtained by replacing a part of the data where the error correcting ECC outer code 32 and the ECC inner code 31 overlap with data other than the original error correcting data. This is because the identification information 35 is handled as an error in the error correction in 53.
[0161]
When the error correction for the data in the reproduction signal Se is completed in step S15, the generated image signal is descrambled in the video circuit 56 and output as an image to a monitor (not shown) and the audio signal. Is reproduced by the audio circuit 57 and output to a speaker (not shown) (step S16). The descrambling in the video circuit 56 is executed by using key data recorded together with other images as the data 24.
[0162]
On the other hand, when the identification information 35 is not detected in the determination in step S14 (step S14; no), the data recorded on the DVD 50 is not the data recorded normally but the data illegally copied. Then, the process is terminated without executing the data reproduction process as it is.
[0163]
As described above, according to the operations of the cutting device C and the information reproducing device S included in the first embodiment of the illegal copy prevention system, the error-corrected reproduced signal Se is reproduced only when the identification information 35 is detected. Therefore, illegal reproduction of data having no identification information 35 (that is, illegally copied) can be prevented.
[0164]
Moreover, since a part of the ECC block 30 after the addition of the ECC inner code 31 and the ECC outer code 32 is replaced with the identification information 35, the identification information 35 disappears due to error correction at the time of reproduction. When the reproduced data is recorded in another information recording device, the identification information 35 is no longer recorded, and when the data can be reproduced only when the identification information 35 is detected, the other information recording device. It is possible to prevent the data recorded in step 1 from being reproduced.
[0165]
Further, since a part of the portion where the ECC inner code 31 and the ECC outer code 32 overlap is partly replaced with the identification information 35, the ECC inner code 31 and the ECC outer code used for error correction of the data itself to be reproduced itself are replaced. The code 32 is not replaced with the identification information 35, and therefore the error correction capability for the data itself is not reduced.
[0166]
(II)Second embodiment of illegal copy prevention system
Next, a second embodiment of the illegal copy prevention system according to the present invention will be described with reference to FIGS.
[0167]
(A)Embodiment of cutting device
First, an embodiment of the cutting apparatus according to a second embodiment (hereinafter simply referred to as a second embodiment) of an illegal copy prevention system will be described with reference to FIGS.
[0168]
In addition, in the cutting apparatus of 2nd Embodiment demonstrated below, the same member number is attached | subjected to the member similar to the cutting apparatus C of 1st Embodiment, and detailed description is abbreviate | omitted.
[0169]
In the cutting device C according to the first embodiment described above, only the identification information 35 is inserted into the ECC block 30. However, in the cutting device according to the second embodiment, other than the identification information 35 is included in the ECC block 30. In addition, generation information, which will be described later, key data when data to be recorded on the DVD 50 is scrambled and modulated in the data generator 1, and position information indicating the position in the ECC block of the identification information 35 after insertion are inserted as authentication information. .
[0170]
Further, each piece of information inserted as the authentication information is inserted not only in the area where the ECC code 31 and the ECC outer code 32 overlap in the ECC block 30, but also in other data areas.
[0171]
That is, as shown in FIG. 8, the cutting apparatus C ′ according to the second embodiment includes an authentication information writer 3 ′ as a replacement means instead of the identification information writer 3 in the cutting apparatus C according to the first embodiment. And an authentication information generator 16 for generating authentication information to be inserted into the ECC block 30.
[0172]
Other configurations and operations are the same as those of the cutting device C of the first embodiment.
[0173]
At this time, as shown in FIG. 9, the authentication information generator 16 includes a key data generation unit 70, an encryption unit 71 as an encryption insertion unit, an identification information generation unit 72, a generation information generation unit 73, The combining unit 74 includes a rearrangement unit 75 as a rearrangement unit, a division unit 76, a division control unit 77, a correction code addition unit 78 as an addition unit, and a position information generation unit 79. .
[0174]
Further, the rearrangement unit 75 includes a buffer 80, a buffer write circuit 81, and a buffer read circuit 82 as shown in FIG.
[0175]
Next, the operation of the authentication information generator 16 and the operation of the authentication information writer 3 'associated therewith will be described with reference to FIGS.
[0176]
First, the key data generation unit 70 generates key data used for the scramble modulation in the data generator 1, outputs the key data to the encryption unit 71 as a key data signal Sk, and outputs it to the data generator 1.
[0177]
Then, the data generator 1 uses a scramble method that is changed according to a preset procedure for each preset time based on the time measured in the cutting device C ′ based on the key data signal Sk. The scramble modulation is performed.
[0178]
At this time, the key data can be set to a different value each time, for example, by being generated by a random number generator (not shown).
[0179]
Next, the encryption unit 71 encrypts the key data included in the input key data signal Sk by a preset method using the parameter P input from the outside, and generates the encrypted key data KK. The encrypted key data signal Skk is output to the combining unit 74.
[0180]
Here, as shown in the uppermost part of FIG. 11, it is assumed that the key data included in the key data signal Sk is, for example, key data of 5 bytes whose contents are “K1 ′” to “K5 ′”. The encryption unit 71 encrypts the 5-byte key data using the parameter P for each byte, and includes, for example, encrypted key data KK consisting of 5 bytes whose contents are “K1” to “K5”. An encryption key data signal Skk is generated.
[0181]
As the parameter P, specifically, for example, the manufacturing number or identification number of the cutting device C ′, the manufacturing number or identification number of the stamper disk SP to be manufactured, or time information is used.
[0182]
The key data need not be encrypted for each byte, but may be encrypted in units of the key data data length (in the above example, 5 bytes).
[0183]
On the other hand, the identification information generation unit 72 generates the identification information 35 to be inserted into the ECC block 30 and outputs it to the synthesis unit 74 as the identification information signal Si.
[0184]
Furthermore, the generation information generation unit 73 generates generation information indicating the scramble method at that time based on the time signal St corresponding to the time counted in the cutting apparatus C ′, and generates the generation information signal Sg as a synthesis unit. Output to 74.
[0185]
The combining unit 74 combines the encrypted key data signal Skk, the identification information signal Si, and the generation information signal Sg, generates a combined signal Sm, and outputs the combined signal Sm to the rearrangement unit 75.
[0186]
Specifically, as shown in the third row from the top of FIG. 11, the operation of the combining unit 74 includes the identification information 35 included in the identification information signal Si (its contents are, for example, “I1” to “I3”). 3 bytes)), the 1-byte generation information GG whose content is “G” and the encryption key data KK are combined to form authentication information N and rearranged as a combined signal Sm. To the unit 75.
[0187]
Next, the rearrangement unit 75 randomly rearranges the authentication information N included in the composite signal Sm for each byte, as shown in the fourth row from the top in FIG. 11, to generate the rearrangement authentication information N ′. The rearranged signal Smr is output to the dividing unit 76.
[0188]
Here, the rearrangement process in the rearrangement unit 75 will be specifically described with reference to FIG. 10. First, when the composite signal Sm is input to the rearrangement unit 75, the rearrangement unit 75 is based on a control signal Scw from a CPU (not shown). In accordance with the designation of the write address included in the write address signal Swa output from the buffer write circuit 81, the authentication information N included in the composite signal Sm is sequentially and temporarily written in the buffer 80. At this time, the write address signal Swa may include control information such as write enable information.
[0189]
The capacity of the buffer 80 is larger than the length of one authentication information N (9 bytes in the case of FIG. 11).
[0190]
When the writing to the buffer 80 is completed, the read address included in the read address signal Sra output from the buffer read circuit 82 based on the control signal Scr from the CPU (not shown) and the parameter P ′ input from the outside is next. The information for each byte in the stored authentication information N is randomly rearranged and read out as a rearranged signal Smr. At this time, the read address signal Sra may include control information such as read enable information.
[0191]
Further, as the parameter P ′ at this time, like the parameter P, the manufacturing number or identification number of the cutting device C ′, the manufacturing number or identification number of the stamper disk SP to be manufactured, time information, or the like is used.
[0192]
  In the rearrangement unit 75, the read address signal SraThanAlthough the rearrangement is performed when the authentication information N is read from the buffer 80, the information of each byte is rearranged and stored when the authentication information N is written to the buffer 80 by the write address signal Swa. You may let them.
[0193]
Next, the dividing unit 76 divides the reordering authentication information N ′ included in the reordering signal Smr based on the dividing method specified by the control signal Sbc from the dividing control unit 77, and the divided authentication information NN. Is generated and output to the correction code adding unit 78.
[0194]
At this time, as a method of dividing the sort authentication information N ′, for example, as shown in the fifth row from the top in FIG. 11, the sort authentication information N ′ may be divided by 3 bytes from the top. , 2 bytes, 3 bytes and 4 bytes may be divided from the head.
[0195]
Here, among each divided authentication information NN, one divided authentication information NN is inserted into one ECC block 30 respectively.
[0196]
Next, the correction code adding unit 78 adds a predetermined number of bytes of error correction code to each of the divided divided authentication information NN, generates a correction signal Scm including the corrected authentication information CM, and writes the authentication information. To the device 3 '.
[0197]
At this time, specifically, as shown in FIG. 11, for example, two pieces of error correction code EE whose contents are “E1” and “E2” are added to one piece of divided authentication information NN, thereby correcting the authentication information. CM is generated.
[0198]
Note that FIG. 11 shows only the addition of the error correction code EE for one divided authentication information NN, but actually, the error correction code EE is added to each of all divided authentication information NNs. The
[0199]
On the other hand, the position information generation unit 79 generates a position signal Spo including position information indicating the position in the ECC block 30 into which the information of each byte included in the generated corrected authentication information CM is inserted, and writes the authentication information. To the device 3 '.
[0200]
In this case, the position information is included in the correction authentication information CM inserted at a random position in each ECC block 30 (that is, a random position including an area other than the ECC code 31 or the ECC outer code 32). Is generated to indicate the position of each byte to be inserted, and further, is generated to indicate the position to be inserted differently for each ECC block 30.
[0201]
Then, as shown in the lowermost part of FIG. 11, the authentication information writer 3 ′ converts the data at a random position in the ECC block 30 included in the additional data signal Sde into the correction authentication information CM and the position signal Spo. The position information PP having the content “PO” is substituted to generate an ECC block 30 ″, and a replacement data signal Sdr including the ECC block 30 ″ is output.
[0202]
At this time, the information of each byte of the correction authentication information CM is inserted at a random position in the ECC block 30 described in the position information PP.
[0203]
In this case, the position information PP is inserted at a specific position set in advance in the ECC block 30. This specific position is determined in advance with the information reproducing apparatus described later. Specifically, for example, a fixed position set in advance on the ECC block 30 may be used, or the address data in the additional data Sde of the ECC block 30 is used as a parameter, and the position is specified based on a predetermined function. It is also possible to do.
[0204]
Thereafter, an operation similar to that of the cutting device C of the first embodiment described above is performed, and a stamper disc SP on which a recording data signal Sr composed of the ECC block 30 ″ including the authentication information N is recorded is formed. As a result, the DVD 50 is mass-produced.
[0205]
Note that a plurality of information sets obtained by combining the correction authentication information CM and the position information PP may be recorded at different positions in the ECC block 30. By recording a plurality of information as described above, when information recorded at a certain position cannot be read due to, for example, a scratch on the DVD 50, the information recorded at another position can be used as a backup.
[0206]
(B)Embodiment of information reproducing apparatus
Next, an embodiment of the information reproducing apparatus according to the second embodiment will be described with reference to FIGS.
[0207]
In the information reproducing apparatus described below, the same members as those of the information reproducing apparatus S of the first embodiment are denoted by the same member numbers, and detailed description thereof is omitted.
[0208]
In the information reproducing apparatus S of the first embodiment described above, the reproduction signal Se reproduced from the DVD 50 is error-corrected and reproduced and output based only on the identification information 35, but the information reproducing apparatus of the second embodiment is reproduced. Then, in addition to the identification information 35, information is reproduced using the generation information GG, key data KK, identification information 35, and position information PP recorded on the DVD 50 as the authentication information N.
[0209]
That is, as shown in FIG. 12, the information reproduction apparatus S ′ of the second embodiment includes an authentication information extraction circuit 65 ′ instead of the identification information extraction circuit 65 in the information reproduction apparatus S of the first embodiment. In addition to these configurations, an error correction circuit 90, a restoration circuit 91, and a decoding circuit 92 are included.
[0210]
Other configurations and operations are the same as those of the information reproducing apparatus S of the first embodiment.
[0211]
Further, as shown in FIG. 13, the decoding circuit 92 includes a decoding unit selection circuit 95 and a first decoding unit 96._-1The second decryption unit 96_-2,..., N-th decoding unit 96_-nAnd is constituted by.
[0212]
Here, the first decoding unit 96_-1The second decryption unit 96_-2,..., N-th decoding unit 96_-nRespectively performs a decoding process corresponding to each scramble method used for the scramble modulation (scramble modulation performed while changing the scramble method according to time) in the data generator 1.
[0213]
Next, the operation of the information reproducing apparatus S ′ will be described.
[0214]
First, the reproduction signal Se is generated by the operations of the optical pickup 51, the RF amplifier 52, and the demodulation circuit 64 described above, and is input to the authentication information extraction circuit 65 '.
[0215]
At this time, the reproduction signal Se includes the correction authentication information CM and the position information PP for each ECC block 30 ″ in addition to the information to be reproduced.
[0216]
Then, the authentication information extraction circuit 65 ′ first extracts the position information PP from the ECC block 30 ″ in the reproduction signal Se (for the position in the ECC block 30 ″ of the position information PP, the information reproduction apparatus S ′ The correction authentication information CM is extracted based on the position information PP and is output to the error correction circuit 90 as a correction authentication information signal Sw ′.
[0217]
In addition to the above-described operation, the authentication information extraction circuit 65 ′ outputs the reproduction signal Se after extracting the correction authentication information CM and the position information PP to the error correction circuit 53 as it is.
[0218]
Next, the error correction circuit 90 performs error correction on the correction authentication information CM using the error correction code EE included in the correction authentication information CM, and is further divided into each ECC block 30 ″. The divided authentication information NN is aggregated, and a correction signal Swc including the above-described replacement authentication information N ′ is generated and output to the restoration circuit 91.
[0219]
Then, the restoration circuit 91 restores the authentication information N by performing a process reverse to the rearrangement process by the rearrangement unit 75 on the rearrangement authentication information N ′.
[0220]
Further, the restoration circuit 91 decrypts the encrypted key data KK in the restored authentication information N by a decryption process corresponding to the encryption process in the encryption unit 71 to generate original key data.
[0221]
The generation information GG included in the authentication information N and the decrypted key data are output to the decryption circuit 92 as the generation information signal Sg and the key data signal Sk, respectively, and the identification information included in the authentication information N An identification information signal Swcm including 35 is generated and output to the CPU 58.
[0222]
Thereby, the CPU 58 executes the processing shown as steps S14 and S15 in FIG. 7 based on the identification information 35.
[0223]
On the other hand, the decoding circuit 92 decodes the content of the corrected reproduction signal Sec that is the error-corrected reproduction signal Se output from the error correction circuit 53 (that is, the scramble corresponding to the scramble modulation executed in the data generator 1). Further, the decoded data is separated into image information and audio information, and an image signal including the image information is output to the video circuit 56, and an audio signal including the audio information is output to the audio circuit 57.
[0224]
Here, the operation of the decryption circuit 92 will be described more specifically. First, the inputted corrected reproduction signal Sec is sent to the decryption unit selected by the decryption unit selection circuit 95 based on the generation information GG. It is output together with the key data included in the data signal Sk.
[0225]
That is, since the generation information GG includes designation information for designating a scramble method in the scramble modulation executed in the data generator 1, based on this designation information, the decoding unit selection circuit 95 executes the executed scramble. A decoding unit having a decoding method corresponding to the method is selected, and the corrected reproduction signal Sec is output to the selected decoding unit together with the key data included in the key data signal Sk.
[0226]
Note that FIG. 13 shows the second decryption unit 96 based on the generation information GG._-2Indicates a selected state.
[0227]
Then, the decoding unit selected by the decoding unit selection circuit 95 (in the case of FIG. 13, the second decoding unit 96)._-2) Decodes (ie, scrambles and demodulates) information included in the corrected reproduction signal Sec using the input key data, and outputs an image signal including the image information and an audio signal including audio information. .
[0228]
As described above, according to the operations of the cutting device C ′ and the information reproducing device S ′ included in the second embodiment of the illegal copy prevention system, the operations of the cutting device C and the information reproducing device S of the first embodiment are performed. In addition to the effect, even if the replacement position of the replacement authentication information N ′ of the ECC block 30 ″ is changed to prevent illegal copying, the replacement authentication information N ′ can be extracted using the position information PP as a clue. Therefore, by changing the replacement position of the permutation authentication information N ′, it is possible to prevent the permutation authentication information N ′ from being illegally read before error correction at the time of information reproduction.
[0229]
Further, since the rearrangement authentication information N ′ is generated by rearranging the contents of each byte constituting the original authentication information N, the rearrangement authentication information N ′ is read before error correction at the time of information reproduction. However, it is possible to prevent the original authentication information N from being recognized.
[0230]
Furthermore, the contents of the encryption process and the time of encryption are included in the generation information GG, and the contents of the decryption process that decrypts the encryption according to the time of the encryption at the time of reproduction are displayed for each encryption process. By selecting for each content, even if the content of one encryption process leaks during the playback, the data encrypted using the content of another encryption process can be decrypted, effectively preventing illegal copying it can.
[0231]
In addition, since the authentication information N includes key data for scramble demodulation, if the authentication information N cannot be obtained at the time of reproduction, the encrypted recorded information cannot be decrypted, and illegal copying can be effectively performed. Can be prevented.
[0232]
Furthermore, since the authentication information N disappears at the time of reproduction, the key data once used for the scramble demodulation at the time of reproduction is also erased, so that the key data can be prevented from leaking to the outside. Copying can be prevented.
[0233]
This configuration is used when, for example, the information reproducing device S ′ is an external storage device of the host computer and the key data needs to be transmitted from the information reproducing device S ′ to the host computer. The key information is included in the authentication information N, and it is determined whether or not the data in the DVD 50 is illegally copied in the information reproducing apparatus S ′, which is an external storage device. Only when the data is not illegally copied, the key data is determined. By encrypting and transmitting to the host computer, illegally copied data is taken into the host computer, thereby preventing the host computer from being infected with a computer virus or the like, for example.
[0234]
Further, since the key data for encryption is further encrypted and included in the authentication information N, it becomes more difficult to illegally scramble and decode the encrypted record information.
[0235]
Further, since the error correction code EE is added to the authentication information N itself, even if the authentication information N becomes an error during reproduction, it can be corrected and the authentication information N can be recognized reliably.
[0236]
Further, since the authentication information N is divided and included in the plurality of ECC blocks 30 ″, the amount of data replaced with the authentication information N decreases when only one ECC block 30 ″ is viewed. It is possible to reduce the overall error correction capability in the ECC block 30 ″.
[0237]
Further, since the authentication information N is rearranged over a plurality of ECC blocks 30 ″, the leakage of the authentication information N can be more effectively prevented during reproduction.
[0238]
In the second embodiment, the position information PP is inserted into the ECC block 30 included in the additional data signal Sde together with the correction authentication information CM. However, the position information PP is configured by image information or the like. The data stream may be inserted as a so-called water mark in an area that is not important in terms of the visual characteristics or auditory characteristics of the user (for example, a high-frequency area of image information).
[0239]
(III)Deformation
Next, modifications of the present invention will be described.
[0240]
That is, as a modification, in each of the above-described embodiments, identification information that has nothing to do with the original error correction code or the like is inserted as the identification information 35. The information equivalent to the identification information can be included in the ECC block 30 without inserting the data.
[0241]
That is, for example, the content of any one byte of data in the ECC block 30 is
d₀, D₁, D₂...... d₆, D₇
Suppose that If the value of a certain bit in the identification information to be included in the ECC block 30 is “3”, the array of data in the 1 byte is shifted by 3 bits,
d_Five, D₆, D₇, D₀, D₁...... d_Four
Are recorded on the DVD 50 (stamper disc SP).
[0242]
At the time of reproduction, when error correction is performed on the rearranged 1-byte data, the bit value in the identification information is determined by determining how much the bit number is shifted to obtain the original data. Is acquired. If this process is repeated for all the bits in the identification information, a function equivalent to the identification information 35 can be realized without inserting any data other than the original data into the ECC block 30 at all.
[0243]
According to the method of this modification, if the content of 1-byte data to be rearranged is, for example, “10101010”, the number of shifts is “0”, “2”, “ 4 ”or“ 6 ”, which may make it impossible to specify. In this case, correct identification information is reproduced by increasing the redundancy in the error correction code or combining pattern matching and error correction. Sometimes you can get it.
[0244]
That is, for example, by repeatedly inserting the data “10101010” (that is, by increasing the redundancy), the number of data combinations that can be made during reproduction is reduced, and each data is correctly identified by error correction. Information (ie correct shift number) can be obtained.
[0245]
Further, in each of the above-described embodiments and modifications, the case where the present invention is applied to data recorded on the DVD 50 has been described. However, the present invention also performs error correction of data using an ECC block. Applicable to all when executed.
[0246]
More specifically, for example, after generating data including the ECC block 30 '(or 30 "), it is transmitted via a telephone line, and it is confirmed that it is not illegally copied at the transmission destination and reproduced. Can be applied in case.
[0247]
Similarly, data transmission by CATV (Cable Television) and information recording / reproduction using MD (Mini Disk), DAT (Digital Audio Tape) or DVD-R (DVD-Recordable). It can also be applied to.
[0248]
(IV)Embodiment according to a combination of the present invention and conventional illegal copy prevention technology
Next, an embodiment in which the present invention and the conventionally proposed illegal copy prevention technology are used together will be described.
[0249]
That is, for example, the key data for unscrambled image information or the like is recorded as recording information, and the identification information 35 is recorded according to the present invention, so that an effect of preventing illegal copying twice can be expected.
[0250]
Here, more specifically, an example in which the illegal copy prevention system of the first embodiment and the conventionally proposed illegal copy prevention technology are used together will be described.
[0251]
First, a conventional technique used in combination with the identification information 35 of the first embodiment to prevent illegal copying will be briefly described. The conventional technique is a human vision on a data stream composed of image information and the like. Specific identification information similar to the above-described water mark is inserted into a portion that is not important in terms of characteristics or auditory characteristics (for example, a high-frequency region of image information).
[0252]
As a configuration in the case of combining this prior art with the identification information 35 of the first embodiment, specifically, CGMS (Copy Generation Management System) data (copying permission or disapproval) as identification information of the prior art Alternatively, time shift recording (data indicating permission or non-permission of content) is recorded in the data area, while CM (Compliance Mark) data (authentication data. That is, illegal data) as the identification information 35 of the first embodiment. (Identification information indicating that it has not been copied) is recorded in an overlapping portion of the ECC inner code 31 and the ECC outer code 32.
[0253]
Here, in the specific example described below, CGMS data and CM data are defined as follows.
[0254]
CGMS data; 00 → copy permission
CGMS data; 01 → Time shift recording permission
CGMS data; 11 → not copyable
CM data; 11 → Authenticated (not illegally copied)
CM data; ** → Not certified (illegally copied)
In this definition, “10” is undefined for CGMS data, and “**” in CM data indicates all data other than “11”.
[0255]
Here, the time shift recording indicates recording a broadcast program for reproduction. That is, the time difference between the actual broadcast time and the time to view the broadcast program is called time shift. Therefore, “01” as CGMS data is added only when image information or the like is obtained by receiving satellite broadcasting, for example, and only when recording is permitted to be played back later. Is.
[0256]
When image information or the like is supplied from the above-described DVD 50, only one of “00” or “11” is added as CGMS data.
[0257]
In addition, since the image information and the like are scrambled using the key data as described above and recorded or transmitted on the optical disc, the CGMS data that is a part of the image information is also scrambled at this time. Recorded or transmitted.
[0258]
Then, an information reproducing device for reproducing the DVD 50 or a satellite broadcast receiver for receiving satellite broadcasting (hereinafter referred to as IRD (Integrated Receiver Decoder)) descrambles and demodulates the image information using key data. After that, it is output as an analog video signal, and this analog video signal also includes CGMS data.
[0259]
On the premise of the above description, the specifics of illegal copying prevention using the identification information 35 of the present invention and the conventional identification information for the case where the image information is supplied from the DVD 50 and the case where the image information is supplied from the IRD will be described below. An example will be described.
[0260]
(A)When image information is supplied from DVD
In the case where image information or the like is supplied from a DVD 50 (hereinafter generally referred to as an optical disc), there are the following devices included in a system that prevents illegal copying.
[0261]
That is, for reproducing image information and the like, a player that reproduces an optical disk and outputs an analog video signal, and image information and the like recorded on the optical disk are computer data, and the digital information is reproduced. And a driver for outputting to a computer.
[0262]
As for recording reproduced image information and the like, there are a recorder for recording an analog video signal output from a player and a writer for recording digital data output from a driver.
[0263]
Here, the player is provided with a decoder IC (Integrated Circuit) for descrambling and decoding image information and the like. The decoder IC stores the key data for descrambling, and is supplied to the player manufacturer under strict management from the supplier supplying the optical disk. At this time, since the decoder IC itself is made into an IC, key data cannot be acquired from the outside, and a substantially illegal player is not manufactured.
[0264]
As for the driver, the driver is positioned as a peripheral device of the computer, and includes a video input board (similar to the decoder IC in the player described above) provided on the computer side. The image data before descrambling (image information reproduced from the optical disk, etc.) is transferred. At this time, before transferring digital data to the video input board, a driver that has been certified as illegal by the supplier of image information or the like must pass a certification code (certified that each other is not illegal). Code data for confirming whether or not the data has been approved), and the data is exchanged only when both are certified. Therefore, when either one of the driver and the video input board is not authorized unless it is illegal, the authorization code cannot be exchanged and the digital data is not exchanged.
[0265]
On the other hand, with respect to these players or drivers, the recorder and the writer are each a recorder or writer that is certified as not illegal and a recorder that is not certified (that is, considered as illegal). Or a writer is considered. Hereinafter, in each case, the prevention of illegal copying will be described for each case.
[0266]
(A)When an authorized recorder records image information from a player
First, the certified recorders exchange the authorization code with the player to confirm that they are not illegal. After the confirmation, CGMS data is extracted from the input analog video signal, and recording of the analog video signal is started only when the CGMS data is “00”.
[0267]
Here, since all the players are certified as illegal, in a recorder certified as illegal, the analog video signal output from the player (in the analog video signal, the CM data is lost due to the configuration of the present invention). "11" is newly added and recorded as CM data. Therefore, in the image information and the like recorded by the certified recorder, the CGMS data is always “00”, and the CM data is always “11”.
[0268]
(B)When an unauthorized recorder records image information from a player
Even when a non-certified recorder is connected to the player, the authorization code is exchanged first. Normally, the authorization code cannot be exchanged at this stage, and the player outputs an analog video signal. It stops and illegal copying is prevented.
[0269]
However, if, for some reason, the player recognizes an unauthorized recorder as an authorized recorder, the analog video signal is output to the recorder and recorded.
[0270]
However, in this case, since the non-certified recorder cannot newly record the CM data as “11”, the CM data in the image information or the like recorded by the recorder as a result is the above “**”. Thus, according to the present invention, the image information or the like is not reproduced by another player, and reproduction of illegally copied image information or the like can be prevented.
[0271]
(C)When playing an optical disc with a certified driver
When playing an optical disc with an authorized driver,
(I) Certified video input board
(Ii) Authorized writer
(Iii) Unauthorized writer
Three are possible.
[0272]
Of these, if an attempt is made to transfer to a non-certified writer in (iii), the above-mentioned certification code executed in the initial stage cannot be exchanged, so the driver may not be certified. Since it can be recognized and digital data is not transferred, illegal copying can be prevented.
[0273]
Next, when transferring to the certified video input board of (i), after the certification code is first exchanged, the video input board receives the digital data from the driver and the CM data in it Only when “11” is “11”, descrambling and decoding are performed, and the result is output to an external device (such as a computer on which the video input board is mounted).
[0274]
Of course, when it is confirmed that the video input board is illegal and not authorized when the authorization code is first exchanged, digital data is not supplied from the driver. .
[0275]
Furthermore, in the case of a certified writer of (ii), the processing is the same as the above-described “when the certified recorder records image information or the like from the player”, and the CGMS data is “00”. In addition, only image information having CM data “11” is recorded and generated.
[0276]
(D)When playing an optical disc with an uncertified driver
In this case, digital data will not be output to the certified video input board by the exchange of the original certification code (from a video input board or driver that is not certified by the writer). Therefore, the digital data is eventually transferred only to the uncertified writer. When digital data is recorded by a non-authorized writer, the CM data becomes “**”. Therefore, the player and the video input board are illegally copied data recorded by the writer. Will not be played back.
[0277]
As described above, as described above, illegally copied optical disks can be substantially eliminated by inserting CGMS data into image information or the like and further inserting CM data into the ECC code area.
[0278]
(B)When image information is supplied from satellite broadcasting
When the IRD that receives and decodes satellite broadcasts and the certified recorder are combined, the certification code is first exchanged between the IRD and the recorder to confirm that they are not illegal. Check.
[0279]
Here, in the image information supplied from the satellite broadcast, the CGMS data is either “01” or “11”. Here, if the CM data is not inserted and the CGMS data is “01”, that is, the time shift recording is permitted, the copied data is illegally copied any number of times.
[0280]
Therefore, a recorder that combines CGMS data and CM data and broadcasts it as satellite broadcast, receives it by IRD, and then records it, executes a mutual recognition process with IRD, and the supplier of image information etc. In the case of IRD, the CGMS data is set to “01” and the CM data is set to “11” to be added to the image information and recorded on an optical disc or a video tape. In this case, it is possible to perform time shift recording from the subsequent optical disk or video data.
[0281]
On the other hand, when the recorder determines that the supplier of image information or the like is not the IRD but the player as a result of mutual recognition (that is, after the satellite broadcast has been received, the player is playing back what was once recorded on the optical disc) If the CGMS data in the image information is “01” or “00”, if it is “01”, the data once recorded on the optical disc or the like is re-copied, so the CM Record the data as “**”. Thereby, since the CM data is “**”, it is not reproduced by a player or the like thereafter, and multi-stage copying and reproduction can be prevented.
[0282]
In this way, even if recording is permitted by the recorder, it is more effective for preventing illegal copying because the optical disk is consumed compared to the case where recording is not permitted by the recorder. .
[0283]
(C)Other specific examples
As another specific example, in addition to the identification information (CGMS) to be inserted into the image information area of the optical disc, authentication data (not illegally copied) as sub-identification information similar to CM data in the image information area. It is also possible to record the CM data in the ECC code area.
[0284]
At this time, the authentication data M and CM data N to be inserted into the image information area are used using a predetermined function f.
[Expression 27]
M = f (N)
Thus, the effect of preventing illegal copying can be further enhanced.
[0285]
That is, when image information or the like is reproduced, if the detected authentication data M and CM data N do not have the relationship described above, the reproduction is not performed.
[0286]
By setting the function f in this way, even if either of the CM data N or the authentication data M is illegally acquired by some method, as long as the function f is not acquired, one of the acquired data is used. Since the other data cannot be obtained, the illegally copied image information or the like can be prevented from being reproduced.
[0287]
If the authentication data M is changed and recorded for each ECC block 30 based on the CM data N and the function f, leakage of the CM data N and the authentication data M itself can be prevented. That is, since the CM data N, and hence the authentication data M, can be changed at random, it is illegal to make the regularity more difficult to specify when compared with the case where only the fixed CM data N is recorded. Copying can be prevented.
[0288]
In the above-described specific example, the case where CGMS data is inserted into the image information area has been described. However, in addition to this, when the image information is MPEG (Moving Picture Expert Group) data, each picture is displayed. Identification data, that is, data indicating whether the picture is an I picture, a P picture, or a B picture may be inserted into the image information area as identification information.
[0289]
In this case, if it is a certified recorder, the original image and the picture type can be made to coincide with each other at the time of encoding for recording and can be recorded accurately.
[0290]
On the other hand, since the image information recorded by an uncertified recorder is recorded without correctly identifying the type of each picture and the correspondence with the original image, the identification and the correspondence are correctly performed by the player. If it is detected that there is no copy, it can be detected that the copy is illegal.
[0291]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the error correction code is added to the output information to generate the correction code additional output information, and a part of the generated correction code additional output information is obtained. Identification informationRearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofFor example, when the generated replacement output information is recorded on the information recording medium and the output information is reproduced from the information recording medium, the replacement output information is generated.Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of output information (that is, illegally copied).
[0292]
  Furthermore, after adding the error correction code, a part of the correction code addition output information isRearrangementWhen replacing recorded information,Resequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0293]
  Therefore, in the information reproducing apparatus that can reproduce the output information only when the identification information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0294]
  Also, for example, when the generated replacement output information is transmitted to another information reproducing apparatus and reproduced, the identification information can be reproduced if reproduction is performed only when the identification information is detected.DetectedEven if no output information is transmitted, the illegal reproduction can be prevented.
[0295]
  Furthermore, after transmissionResequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0296]
  Therefore,identificationIn an information reproducing apparatus that can reproduce output information only when information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
[0297]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the sub-identification information M and the identification information N are
[Expression 28]
M = f (N)
For example, when the output information recorded on the information recording medium is reproduced, the output information is reproduced only when the identification information N and the sub-identification information M are both obtained. Even if either one of N or sub-identification information M is acquired by some illegal method, unless the function f is specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. Therefore, in the reproducing apparatus that reproduces the recorded output information, the illegally copied output information can be more effectively prevented from being reproduced.
[0298]
  According to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the error correction code is constituted by the check symbol of the inner code and the check symbol of the outer code, and the inner code A part of the overlap of the check symbol of the outer code and the check symbol of the outer codeRearrangementSince the information is replaced with the information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the output information itself when reproducing the output information recorded on the information recording mediumRearrangementThere is no replacement with information, and the error correction capability for the output information itself is not reduced.
[0299]
Similarly, even when the transmitted output information is reproduced, the error correction capability for the output information itself does not deteriorate.
[0300]
  According to the fourth aspect of the present invention, a part of the correction code-added recording information formed by adding the error correction code to the recording information is used as the identification information.Rearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofSince the replacement recording information formed by replacement is recorded, when reproducing the replacement recording information from the information recording medium,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0301]
  Also, some of the correction code-added recording information with the error correction code added isRearrangementSince it is replaced with information,Resequence information is extracted, therebyEven if the identification information is detected and the recorded information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when recording the reproduced recording information on another information recording device,RearrangementInformation is no longer recorded.
[0302]
  Therefore, in the information reproducing apparatus that can reproduce the recorded information only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0303]
  According to the invention described in claim 5, in addition to the effect of the invention described in claim 4, in the replacement record information for preventing illegal copying.RearrangementEven if the information replacement position has been changed, the position information is used as a clue.RearrangementSince information can be extracted,RearrangementBy changing the information replacement position, before error correction during playback of recorded informationRearrangementInformation can be prevented from being read illegally.
[0304]
  According to the invention described in claim 6, in addition to the effect of the invention described in claim 4 or 5, the identification information is generated by rearranging the codes constituting the original identification information indicating that it is not illegal copying. Therefore, before error correction when recording information is played backRearrangementEven if the information is read, the original original identification information can be prevented from being recognized.
[0305]
According to the invention described in claim 7, in addition to the effect of the invention described in claim 6, since the rearrangement is performed over a plurality of error correction units, the recorded information is more effectively reproduced. The leakage of identification information can be prevented.
[0306]
  According to the invention described in claim 8, in addition to the effect of the invention described in any one of claims 4 to 7, it isRearrangementSince information is included, the leakage of identification information can be more effectively prevented when recording information is recorded.
[0307]
According to the ninth aspect of the invention, in addition to the effect of the invention according to any one of the fourth to eighth aspects, the contents of the encryption process and the encryption time are included in the generation information. If the content of each encryption process is selected for each encryption process, the content of one encryption process leaks at the time of output, if the decryption process content that decrypts the encryption according to the encryption time is selected when the recorded information is reproduced. Record information encrypted using the contents of other encryption processing can be decrypted, and illegal copying can be effectively prevented.
[0308]
According to the invention described in claim 10, in addition to the effect of the invention described in claim 9, since the encrypted output information cannot be decrypted if the identification information cannot be obtained at the time of reproduction, the illegal copying can be effectively performed. Can be prevented.
[0309]
According to the invention described in claim 11, in addition to the effect of the invention described in claim 10, since the encryption key for encryption is further encrypted, the encrypted record information is decrypted. This can make it more difficult.
[0311]
  Claim12According to the invention described in claim 4,11In addition to the effect of the invention described in any one of the above, the sub-identification information is added in advance to the record information, and the correction code-added record information is added to the record information to which the sub-identification information is added. It is formed by adding an error correction code, and the sub-identification information M and the identification information N are based on a preset function f,
[Expression 29]
  M = f (N)
  Therefore, if the recording information is reproduced only when the identification information N and the sub-identification information M are obtained together when reproducing the recording information from the information recording medium, the identification information N or the sub-information is reproduced. Even if either one of the identification information M is obtained by any illegal method, unless the function f is specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. In a reproducing apparatus that reproduces information, the illegally copied output information can be more effectively prevented from being reproduced.
[0312]
  Claim13According to the invention described in claim 4,12In addition to the effect of the invention described in any one of the above, the error correction code is composed of a check symbol of the inner code and a check symbol of the outer code, and the check symbol of the inner code and the check symbol of the outer code are Some of the overlapping partsRearrangementSince it is recorded after being replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementThe information is not replaced, and the error correction capability for the recorded information itself is not lowered.
[0313]
  Claim14According to the invention described inObtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementOnly when the identification information is detected, the recorded information after error correction can be reproduced.Not detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0314]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0315]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0316]
  Claim15According to the invention described inObtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementOnly when the identification information is detected, the recorded information can be reproduced.Not detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0317]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0318]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0319]
  Claim16According to the invention described in claim14Or15In addition to the effects of the invention described in (2), since the recorded information is reproduced only when the identification information N and the sub-identification information M are both obtained, any one of the identification information N and the sub-identification information M is an invalid method. If the function f is not specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. Therefore, when reproducing information, the illegally copied output information is obtained. Can be more effectively prevented from being reproduced.
[0320]
  Claim17According to the invention described in claim14From16In addition to the effect of the invention described in any one of the above, the error correction code is composed of a check symbol of the inner code and a check symbol of the outer code, and the check symbol of the inner code and the check symbol of the outer code are Some of the overlapping partsRearrangementSince it is replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementIt is not replaced with information, and therefore the error correction capability for the recorded information itself does not deteriorate.
[0321]
  Claim18According to the invention described in the above, an error correction code is added to the output information to generate correction code additional output information, and a part of the generated correction code additional output information is identified as identification information.Rearrangement information generated by moving the array of the data that constitutes the part by an amount corresponding to the value ofFor example, when the generated replacement output information is recorded on the information recording medium and the output information is reproduced from the information recording medium, the replacement output information is generated.Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementIf playback is made possible only when the identification information is detected, the identification informationNot detectedIt is possible to prevent illegal reproduction of output information (that is, illegally copied).
[0322]
  Furthermore, after adding the error correction code, a part of the correction code addition output information isRearrangementWhen replacing recorded information,Resequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0323]
  Therefore, in the information reproducing apparatus that can reproduce the output information only when the identification information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0324]
  Also, for example, when the generated replacement output information is transmitted to another information reproducing apparatus and reproduced, the identification information can be reproduced if reproduction is performed only when the identification information is detected.Not detectedEven if output information is transmitted, illegal reproduction of the output information can be prevented.
[0325]
  Furthermore, after transmissionResequence information is extracted, therebyEven if the identification information is detected and the output information is played back,RearrangementThe information will disappear due to error correction at the time of reproduction, and when the reproduced output information is recorded by the information recording device,RearrangementInformation is no longer recorded.
[0326]
  Therefore,identificationIn an information reproducing apparatus that can reproduce output information only when information is detected, it is possible to prevent the output information recorded by the information recording apparatus from being reproduced.
[0327]
  Claim19According to the invention described in claim18In addition to the effects of the invention described in the above, in the replacement output information to prevent illegal copyingRearrangementEven if the information replacement position is changed, the position information is used as a clue.RearrangementSince information can be extracted,RearrangementBy changing the information replacement position, it is possible to prevent the identification information from being illegally read before error correction.
[0328]
  Claim20According to the invention described in claim18Or19In addition to the effects of the invention described in the above, since the identification information is generated by rearranging the codes constituting the original identification information indicating that it is not illegal copying, before error correction at the time of output of the output informationRearrangementInformation is read, So identification information is detectedIn addition, the original original identification information can be prevented from being recognized.
[0329]
  Claim21According to the invention described in claim20In addition to the operation of the invention described in (1), since rearrangement is performed over a plurality of error life units, it is possible to more effectively prevent leakage of identification information when outputting output information.
[0330]
  Claim22According to the invention described in claim18From21In addition to the effect of the invention described in any one of the above, one over a plurality of error correction units.RearrangementSince the information is included, the leakage of the identification information can be more effectively prevented when outputting the output information.
[0331]
  Claim23According to the invention described in claim18From22In addition to the effect of the invention described in any one of the above, since the contents of the encryption process and the encryption time are included in the generation information, encryption is performed according to the encryption time when the output information is output If the content of the decryption process that solves the problem is selected for each content of each encryption process, even if the content of one encryption process leaks during the output, the output encrypted using the content of the other encryption process Information can be deciphered and illegal copying can be effectively prevented.
[0332]
  Claim24According to the invention described in claim23In addition to the effects of the invention described in (1), if the identification information cannot be acquired, the encrypted output information cannot be decrypted, so that illegal copying can be effectively prevented.
[0333]
  Claim25According to the invention described in claim24In addition to the operation of the invention described in (1), since the encryption key for encryption is further encrypted, it is possible to make it difficult to decrypt the encrypted output information.
[0335]
  Claim26According to the invention described in claim18From25In addition to the effect of the invention described in any one of the above, for example, when the output information recorded on the information recording medium is reproduced, the output information is reproduced only when both the identification information N and the sub-identification information M are obtained. With this configuration, even when either one of the identification information N and the sub-identification information M is acquired by some illegitimate method, as long as the function f is not specified, the other information (the sub-identification information M or the identification information N ) Cannot be obtained correctly. Therefore, in the reproducing apparatus for the recorded output information, the illegally copied output information can be more effectively prevented from being reproduced.
[0336]
  Claim27According to the invention described in claim18From26In addition to the effect of the invention according to any one of the above, the error correction code is composed of a check symbol for the inner code and a check symbol for the outer code, and the check symbol for the inner code and the check symbol for the outer code are A part of the overlapRearrangementSince the information is replaced with the information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded output information itself at the time of reproducing the output information recorded on the information recording mediumRearrangementThere is no replacement with information, and the error correction capability for the output information itself is not reduced.
[0337]
  Similarly, even when the transmitted output information is reproduced, the error correction capability for the output information itself does not deteriorate.
  According to the invention of claim 28, the movement amount of the arrangement of the rearrangement information necessary for obtaining the data before moving the arrangement is obtained from the extracted rearrangement information, and identification is performed based on the movement amount. Since the recorded information after error correction can be reproduced only when the information is detected, illegal reproduction of the recorded information in which the identification information is not detected (that is, illegally copied) can be prevented.
In addition, since a part of the correction code addition recording information after the error correction code is added is replaced with the rearrangement information, the rearrangement information disappears due to error correction at the time of reproduction, and the reproduced recording is performed. The reordering information is no longer recorded when the information is recorded on another information recording device.
Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0338]
  According to the invention of claim 29,Obtain the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and based on the amount of movementOnly when the identification information is detected, the error-corrected recording information can be reproduced.Not detectedIt is possible to prevent illegal reproduction of recorded information (that is, illegally copied).
[0339]
  In addition, a part of the correction code-added recording information after the error correction code is added isRearrangementSince the information has been replaced,RearrangementWhen the recorded information is recorded on another information recording device, the information will disappear due to error correction during playback.RearrangementInformation is no longer recorded.
[0340]
  Therefore, when the recorded information can be reproduced only when the identification information is detected, it is possible to prevent the recorded information recorded by the other information recording apparatus from being reproduced.
  Furthermore, since the rearrangement information is generated by moving the data array that forms part of the correction code additional output information by an amount corresponding to the value of the identification information, the original data is included in the correction code additional output information. Unauthorized reproduction of output information can be prevented without inserting any other data.
[0341]
  Claim30According to the invention described in claim31In addition to the effects of the invention described in (2), since the recorded information is reproduced only when the identification information N and the sub-identification information M are obtained together, either the identification information N or the sub-identification information M is an invalid method. If the function f is not specified, the other information (sub-identification information M or identification information N) cannot be obtained correctly. Therefore, in the information reproducing apparatus, the illegally copied output information Can be more effectively prevented from being reproduced.
[0342]
  Claim31According to the invention described in claimAny one of 28 to 30In addition to the effects of the invention described in (1), the error correction code is composed of an inner code check symbol and an outer code check symbol, and one of the portions where the inner code check symbol and the outer code check symbol overlap. PartRearrangementSince it is replaced with information, the check symbol of the inner code and the check symbol of the outer code used for error correction of the recorded information itself areRearrangementIt is not replaced with information, and therefore the error correction capability for the recorded information itself does not deteriorate.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a cutting apparatus according to a first embodiment.
FIG. 2 is a flowchart showing a cutting operation of the first embodiment.
FIG. 3 is a diagram showing a structure of an ECC block in the data of the first embodiment, (a) is a diagram showing a structure of a data sector, and (b) is a diagram showing a structure of the ECC block.
FIG. 4 is a diagram illustrating a structure of an ECC block after insertion of identification information according to the first embodiment.
FIG. 5 is a diagram illustrating a physical format of data according to the first embodiment.
FIG. 6 is a block diagram showing a schematic configuration of the information reproducing apparatus according to the first embodiment.
FIG. 7 is a flowchart showing a reproduction operation of the first embodiment.
FIG. 8 is a block diagram showing a schematic configuration of a cutting device according to a second embodiment.
FIG. 9 is a block diagram illustrating a detailed configuration of an authentication information generator according to the second embodiment.
FIG. 10 is a block diagram illustrating a detailed configuration of a rearrangement unit according to the second embodiment.
FIG. 11 is a diagram illustrating an operation of the cutting device according to the second embodiment.
FIG. 12 is a block diagram showing a schematic configuration of an information reproducing apparatus according to a second embodiment.
FIG. 13 is a block diagram showing a detailed configuration of a decoding circuit according to a second embodiment.
[Explanation of symbols]
1 ... Data generator
2 ... ECC encoder
3 ... Identification information writer
3 '... Authentication information writer
4 ... Encoder
5 ... Laser generator
6 ... Optical modulator
7 ... Objective lens
8 ... Rotary servo circuit
9 ... Rotation detector
10 ... Feed servo circuit
11 ... Position detector
12 ... Feeding unit
13 ... Spindle motor
14 ... resist
15 ... Glass substrate
16 ... Authentication information generator
20: Data sector
21 ... ID information
22 ... ID information error correction code
23 ... Preliminary data
24, 41, 43 ... data
25 ... Error detection code 25
30, 30 ', 30 "... ECC block
31 ... ECC code
32 ... ECC outer code
33 ... Data block
34 ... Correction block
35 ... Identification information
40 ... Recording sector
42 ... Sync frame
50 ... DVD
51 ... Optical pickup
52 ... RF amplifier
53, 90 ... error correction circuit
54 ... Spindle driver
55 ... Spindle motor
56 ... Video circuit
57. Audio circuit
58 ... CPU
59 ... Control panel
60 ... RAM
61 ... Servo circuit
62 ... Focus driver
63 ... Tracking driver
64. Demodulator circuit
65. Identification information extraction circuit
65 '... Authentication information extraction circuit
66 ... display section
70: Key data generation unit
71: Encryption unit
72. Identification information generating unit
73 ... Generation information generation unit
74. Composition unit
75 ... Rearrangement Department
76: Dividing part
77. Division control unit
78 ... Correction code adding unit
79: Position information generation unit
80 ... buffer
81. Buffer writing circuit
82. Buffer read circuit
91 ... Restoration circuit
92 ... Decoding circuit
95 ... Decoding part selection circuit
96_-1... First decoding part
96_-2... Second decoding part
96_-n... nth decoding part
C, C '... Cutting device
S, S '... information reproducing apparatus
H, H '... header
KK ... Encryption key data
N ... Authentication information
N '... Rearrangement authentication information
NN: Split authentication information
CM: Correction authentication information
PP ... Location information
EE ... Error correction code
P, P '... parameters
Sd: Data signal
Sde: Additional data signal
Sdr: Replacement data signal
Sr: Recording data signal
Sp: Detection signal
Sfe: Focus error signal
Ste ... Tracking error signal
Sfd: Focus drive signal
Std: Tracking drive signal
Srf ... RF signal
Se: Playback signal
Sw, Si, Swcm ... Identification information signal
Sw '... Correction authentication information signal
Spo: Position signal
Scm, Swc ... Correction signal
St: Time signal
Sg ... Generation information signal
Skk: Encryption key data signal
Sk: Key data signal
Sm ... Composite signal
Smr ... Rearrangement signal
Scw, Scr, Sbc ... Control signal
Swa: Write address signal
Sra: Read address signal
Sec ... Corrected playback signal
Ssc: Divided signal

Claims (31)

An additional step of adding an error correction code used for error correction at the time of outputting the output information to the output information to be output, and generating correction code additional output information;
By moving a part of the generated correction code-added output information by an amount of data constituting the part by an amount corresponding to a value of identification information indicating that the output information is not illegally copied A replacement step of replacing the generated rearrangement information and generating replacement output information;
An information generation method comprising: The information generation method according to claim 1,
A sub-identification information adding step of adding sub-identification information indicating that the output information is not illegally copied to the output information;
In the addition step, the error correction code is added to the output information to which the sub-identification information is added, and the correction code addition output information is generated.
The sub-identification information M and the identification information N are based on a preset function f,

An information generation method characterized by having a relationship of The information generation method according to claim 1 or 2,
The error correction code is composed of an inner code check symbol and an outer code check symbol;
In the replacing step, a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap is replaced with the rearrangement information. A part of the recording information with correction code added by adding an error correction code used for error correction at the time of reproduction of the recording information to the recording information to be recorded is not an illegal copy of the recording information. The replacement record information formed by replacing the rearrangement information generated by moving the data array constituting the part by an amount corresponding to the value of the identification information indicating that Information recording medium. The information recording medium according to claim 4,
That part of the correction code addition recording information, wherein the replacement recording information generated is substituted in the position information indicating the position of the rearrangement information in the rearrangement information and the replacement recording in the information is recorded A characteristic information recording medium. The information recording medium according to claim 4 or 5,
The information recording medium is characterized in that the identification information is generated by rearranging each code constituting preset original identification information indicating that the recorded information is not illegally copied. The information recording medium according to claim 6,
The identification information is generated by rearranging codes in the original identification information corresponding to a plurality of error correction units at a time for an error correction unit that is a correction unit in the error correction. Information recording medium. In the information recording medium according to any one of claims 4 to 7,
For the error correction unit that is a correction unit in the error correction, a part of the correction code-added recording information is replaced with the rearrangement information so that one rearrangement information is included across a plurality of the error correction units. An information recording medium on which the replacement recording information generated in this manner is recorded. In the information recording medium according to any one of claims 4 to 8,
The recording information before the addition of the error correction code is encrypted by different encryption processing corresponding to the encryption time,
The information recording medium is characterized in that the identification information includes generation information indicating the content of the encryption processing in the encryption and the encryption time. The information recording medium according to claim 9,
The information recording medium, wherein the identification information includes encryption key information used for the encryption processing. The information recording medium according to claim 10,
An information recording medium, wherein the encryption key information is encrypted by a predetermined encryption process and then inserted into the identification information. The information recording medium according to any one of claims 4 to 11 ,
Sub-identification information indicating that the record information is not illegally copied is added in advance to the record information,
Further, the correction code addition recording information is formed by adding the error correction code to the recording information to which the sub-identification information is added,
The sub-identification information M and the identification information N are based on a preset function f,

An information recording medium characterized by the following relationship: The information recording medium according to any one of claims 4 to 12 ,
The error correction code is composed of an inner code check symbol and an outer code check symbol;
An information recording medium, wherein a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap is replaced with the rearrangement information and recorded. A part of the recording information with correction code added by adding an error correction code used for error correction at the time of reproduction of the recording information to the recording information to be recorded is not an illegal copy of the recording information. An information recording medium on which replacement recording information is formed which is formed by replacing the rearrangement information generated by moving the array of the data constituting the part by an amount corresponding to the value of the identification information indicating An information reproducing method for reproducing the recorded information from:
A detection step of detecting the replacement recording information from the information recording medium;
An extraction step of extracting the rearrangement information from the detected replacement record information;
Obtaining the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and whether the identification information has been acquired based on the amount of movement A determination step for determining;
A reproduction step of performing error correction on the replacement recording information using the error correction code only when the identification information is acquired, and reproducing the recording information;
An information reproducing method comprising: A part of the recording information with correction code added by adding an error correction code used for error correction at the time of reproduction of the recording information to the recording information to be recorded is not an illegal copy of the recording information. An information recording medium on which replacement recording information is formed which is formed by replacing the rearrangement information generated by moving the array of the data constituting the part by an amount corresponding to the value of the identification information indicating An information reproducing method for reproducing the recorded information from:
A detection step of detecting the replacement recording information from the information recording medium;
An extraction step of extracting the rearrangement information from the detected replacement record information;
Obtaining the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and whether the identification information has been acquired based on the amount of movement A determination step for determining;
An error correction step of performing error correction on the detected replacement recording information using the error correction code;
A reproduction step of reproducing the recording information based on the error-corrected replacement recording information only when the identification information is acquired ;
An information reproducing method comprising: The information reproduction method according to any one of claims 14 and 15 ,
Sub-identification information indicating that the record information is not illegally copied is added in advance to the record information, and the correction code-added record information is further added to the record information to which the sub-identification information is added. The sub-identification information M and the identification information N are formed based on a function f set in advance.

In relation to
In the extraction step, the identification information and the sub-identification information are extracted from the replacement record information,
In the determination step, whether or not the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is based on the function f.

To determine whether or not
In the reproduction step, the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is

An information reproducing method, wherein the recorded information is reproduced only when the relationship is as follows. The information reproduction method according to any one of claims 14 to 16 ,
The error correction code is composed of an inner code check symbol and an outer code check symbol;
An information reproducing method characterized in that a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap is replaced with the rearrangement information. An adding means for adding an error correction code used for error correction at the time of outputting the output information to the output information to be output, and generating correction code additional output information;
By moving a portion of the generated correction code-added output information by an amount corresponding to a value of identification information indicating that the output information is not illegally copied, by moving an array of data constituting the portion A replacement means for replacing the generated rearrangement information and generating replacement output information;
An information generation device comprising: The information generation device according to claim 18 ,
The replacement unit replaces a part of the generated correction code added output information with the rearrangement information and position information indicating the position of the rearrangement information in the replacement output information, and generates the replacement output information. An information generation device characterized by: The information generation device according to claim 18 or 19 ,
And further comprising rearrangement means for rearranging respective codes constituting preset original identification information indicating that the output information is not illegally copied to generate the identification information;
The replacement means regenerates a part of the generated correction code-added recording information generated by moving an array of data constituting the part by an amount corresponding to the value of the generated identification information. An information generating apparatus, wherein the information is replaced with sequence information and the replacement output information is generated. The information generation device according to claim 20 ,
The rearranger rearranges the codes in the original identification information corresponding to a plurality of error correction units at a time for the error correction unit that is a correction unit in the error correction, and generates the identification information. An information generation device. In the information generating device according to any one of claims 18 to 21 ,
The replacement means re-configures a part of the correction code-added output information for the error correction unit, which is a correction unit in the error correction, so as to include one reordering information across a plurality of the error correction units. An information generation device characterized by replacing with sequence information. In the information generating device according to any one of claims 18 to 22 ,
And further comprising encryption means for encrypting the output information before addition of the error correction code by different encryption processing corresponding to the encryption time;
The information generation apparatus characterized in that the identification information includes generation information indicating the content of the encryption processing in the encryption means and the encryption time. The information generation device according to claim 23 ,
An information generation apparatus characterized in that the identification information includes encryption key information used for encryption processing in the encryption means. The information generation apparatus according to claim 24 ,
An information generation apparatus, further comprising: an encryption insertion unit that inserts the encryption key information into the identification information after encrypting the encryption key information by a preset encryption process. In the information generating device according to any one of claims 18 to 25 ,
Sub-identification information adding means for adding sub-identification information indicating that the output information is not illegally copied to the output information,
The adding means adds the error correction code to the output information to which the sub-identification information is added, generates the correction code additional output information,
The sub-identification information M and the identification information N are based on a preset function f,

An information generation device characterized by having a relationship of The information generating device according to any one of claims 18 to 26 ,
The error correction code is composed of an inner code check symbol and an outer code check symbol;
The replacement unit replaces a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap with the rearrangement information. A portion of the correction code-added recording information formed by adding an error correction code used for error correction at the time of reproduction of the recording information to the recording information to be recorded is not an illegal copy of the recording information An information recording medium on which replacement recording information formed by replacement with rearrangement information generated by moving an array of data constituting the part by an amount corresponding to the value of identification information indicating An information reproducing apparatus for reproducing the recorded information from
  Detecting means for detecting the replacement recording information from the information recording medium;
  Extraction means for extracting the rearrangement information from the detected replacement record information;
  Obtaining the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and whether the identification information has been acquired based on the amount of movement Determining means for determining;
  Reproduction means for performing error correction on the replacement recording information using the error correction code only when the identification information is acquired, and reproducing the recording information;
  An information reproducing apparatus comprising: A part of the recording information with correction code added by adding an error correction code used for error correction at the time of reproduction of the recording information to the recording information to be recorded is not an illegal copy of the recording information. An information recording medium on which replacement recording information is formed which is formed by replacing the rearrangement information generated by moving the array of the data constituting the part by an amount corresponding to the value of the identification information indicating An information reproducing apparatus for reproducing the recorded information from
Detecting means for detecting the replacement recording information from the information recording medium;
Extraction means for extracting the rearrangement information from the detected replacement record information;
Obtaining the amount of movement of the sequence of the rearrangement information necessary to obtain the data before moving the sequence from the extracted rearrangement information, and whether the identification information has been acquired based on the amount of movement Determining means for determining;
Error correction means for performing error correction on the detected replacement recording information using the error correction code;
Reproduction means for reproducing the recording information based on the error-corrected replacement recording information only when the identification information is acquired ;
An information reproducing apparatus comprising: The information reproducing apparatus according to claim 28 or 29 ,
Sub-identification information indicating that the record information is not illegally copied is added in advance to the record information, and the correction code-added record information is further added to the record information to which the sub-identification information is added. The sub-identification information M and the identification information N are formed based on a function f set in advance.

In relation to
The extraction means extracts the identification information and the sub-identification information from the replacement record information,
The determination means determines whether or not the identification information is extracted, and the relationship between the identification information N and the sub-identification information M is based on the function f.

To determine whether or not
The reproducing means extracts the identification information, and the relationship between the identification information N and the sub-identification information M is

An information reproducing apparatus, wherein the recorded information is reproduced only when the relationship is The information reproducing apparatus according to any one of claims 28 to 30 , wherein
The error correction code is composed of an inner code check symbol and an outer code check symbol;
An information reproducing apparatus, wherein a part of a portion where the check symbol of the inner code and the check symbol of the outer code overlap is replaced with the rearrangement information.

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