JP2002093045A - Information recording and reproducing device and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording and reproducing device and a recording medium which disable watermark information to be found. SOLUTION: This information recording and reproducing device which records and reproduces digital information to and from a recording medium is equipped with a ciphering means which ciphers the watermark information by using an ID as a key, an encoding means which superposes the ciphered watermark information on the digital information, and a recording means which records on the recording medium the digital information having the watermark information superposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus and a recording medium for recording watermark information on digital information and recording the digital information on a recording medium.

[0002]

2. Description of the Related Art Today, copyrighted works such as music and movies are recorded on CDs.
And DVDs and other recording media for sale. On the other hand, illegal copying is performed from recording media sold in this way.

Therefore, in order to determine whether or not the information recorded on the recording medium is illegally copied, a so-called electronic watermark is superimposed on the recording information so that the user cannot discriminate the determination information. are doing.

[0004]

Heretofore, this watermark information has been superimposed at a predetermined position of the recording information. Therefore, by examining information recorded on a plurality of recording media, the position or value at which the watermark information is recorded is determined, and the watermark information may be falsified and copied.

The present invention provides an information recording / reproducing apparatus and a recording medium in which watermark information is not determined.

[0006]

According to a first aspect of the present invention, there is provided an information recording / reproducing apparatus for recording / reproducing digital information on / from a recording medium, comprising: an encrypting means for encrypting watermark information using an ID as a key; Encoding means for superimposing the watermark information encrypted by the means on the digital information, and recording means for recording the digital information on which the watermark information encrypted by the encoding means is superimposed on the recording medium.

In the invention of claim 2, a random number generating means for generating a random number using an ID as a key is provided in place of the encrypting means, and a random number generating means is provided at a position of the digital information corresponding to the random number generated by the random number generating means. The watermark information is superimposed by the encoding means.

In the invention according to claim 3, the encrypting means and the random number generating means are provided, and the watermark information is encrypted and superimposed on the position of the digital information corresponding to the generated random number. In the invention according to claim 4, the ID is an ID assigned to the recording medium.

According to a fifth aspect of the present invention, when digital information on which watermark information recorded on a recording medium A is superimposed is copied to a recording medium B, the I information of the recording medium A is used.
The ID of D and the recording medium B is the ID. In the invention according to claim 6, the ID of the recording medium A is recorded on the recording medium B.

According to the invention of claim 7, the ID of the recording medium A is encrypted and recorded on the recording medium B. In the invention according to claim 8, a recording medium in which watermark information is recorded by being superimposed on digital information,

The watermark information is encrypted using an ID as a key. In the invention of claim 9, the watermark information is superimposed on a position of the digital information corresponding to a random number generated using an ID as a key. In the invention of claim 10, the watermark information is encrypted using an ID as a key, and the encrypted watermark information is superimposed on the position of the digital information corresponding to a random number generated using the ID as a key.

In the invention according to claim 11, the ID is an ID assigned to the recording medium.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a first embodiment of the present invention, and FIG. 2 is an operation flowchart of the first embodiment.

In FIG. 1, 1 is a buffer memory, 2 is a watermark information recording unit, 3 is an input unit, 4 is a writing / reading unit, 5 is a digital watermark encoder, 6 is an encryption unit, 7 is a control unit, 8
Denotes an interface (I / O), 9 denotes a processor (CPU) for processing, and 10 denotes a recording medium.

Next, the operation of the first embodiment will be described with reference to FIG. In step S1, the operator operates the input unit 3
When a recording data transfer request is input, the control unit 7
8 to the connected device. In step S2, the control unit 7 records, in the buffer memory 1, the recording data transferred from the connected device via the I / O 8 in response to the transfer request transmitted in step S1.

In step S 3, when the operator inputs watermark information and ID such as creation date, copyright holder, and copy permission information from the input unit 3, the control unit 7 records the watermark information in the watermark information recording unit 2. In step S4, the control unit 7 reads the ID and the watermark information recorded in the watermark information recording unit 2, instructs the encryption unit 6 to encrypt the watermark information using the ID as a key, and encrypts the encrypted watermark information. Is recorded in the watermark information recording unit 2 again.

In step S 5, the control section 7 reads out the recording data recorded in the buffer memory 1 and sends it to the digital watermark encoder 5. In step S6, the control unit 7 reads the encrypted watermark information recorded in the watermark information recording unit 2 when the recording data read from the buffer memory 1 at a predetermined position in step S5, 5 and encodes and superimposes it on the recording data.

In step S7, the control unit 7 transfers the recording data output from the digital watermark encoder 5 to the writing / reading unit 4, records it on the recording medium 10, and ends the processing.
In the first embodiment, the encryption unit 6 encrypts the watermark information using the ID as a key and superimposes the watermark information on a predetermined position of the recording data. However, the encryption unit 6 is replaced with a random number generation unit that generates a random number. A random number may be generated using the ID as a key, and the watermark information may be encoded and superimposed on the recording data at intervals of a value corresponding to the generated random number.

Further, an encryption unit and a random number generation unit may be provided to encrypt the watermark information, encode the watermark information at intervals of values corresponding to the random numbers, and superimpose the encoded information on the recording data. In the first embodiment, the ID is input from the input unit 3 in step S3. However, the ID may be the serial number, model, manufacturer, etc. of the recording medium 10, and this ID is written and read from the recording medium 10. The information may be read out from the unit 4 and obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a configuration diagram of the second embodiment, and FIG. 4 is an operation flowchart of the second embodiment. The second embodiment is applied to a case where recording data recorded on a recording medium is copied to another recording medium. The configuration of the second embodiment shown in FIG. 3 is the same as that of the first embodiment described with reference to FIG. In the configuration of the embodiment, the writing / reading unit 11 and the recording medium 12
Is added.

Next, the operation of the second embodiment will be described with reference to FIG. In step S10, the control unit 7 instructs the writing / reading unit 4 to read the recording data recorded on the recording medium (A) 10, and records the recording data in the buffer memory 1. In step S11, the control unit 7 instructs the writing / reading unit 4 to read ID _A , which is the ID of the recording medium (A) recorded at a predetermined position of the recording medium (A) 10, and outputs the watermark information recording unit Record in 2.

In step S12, the control section 7 reads out the data at a predetermined position of the recording data recorded in the buffer memory 1, transfers the data to the digital watermark encoder 5, and decodes and encrypts the watermark information and the recording data. And the separated encrypted watermark information is recorded in the watermark information recording unit 2, and the separated recording information is recorded at the original position read from the buffer memory 1.

[0023] In step S13, the control unit 7 records the ID _B is the ID of the recording medium instructs the write and read unit 11 (B) 12 from the recording medium (B) reads the watermark information recording unit 2. In step S14, the control unit 7 instructs the write and read unit 11 records the ID _A of reads in step S11 is recorded in the watermark information recording unit 2 reads, at a predetermined position of the recording medium 12.

In step S15, the control unit 7 sets the watermark
ID recorded in the information recording unit 2 _BAnd encrypted
The read watermark information is transferred to the encryption unit 6, and the ID_BTo
The watermark information encrypted as the key is encrypted again.

In step S16, the control unit 7 sequentially reads out the recording data recorded in the buffer memory 1 and transfers it to the digital watermark encoder 5, and proceeds to step S17 to re-encrypt the recording data at a predetermined position in step S15. The watermark information thus read is read from the watermark information recording unit 2, encoded and superimposed.

In step S18, the control unit 7 instructs the writing / reading unit 11 to record the recording data on which the watermark information output from the digital watermark encoder 5 is superimposed, and records the recording data on the recording medium (B) 12.

In the second embodiment, the encrypted watermark information read and separated from the recording medium (A) 10 is re-encrypted using the ID _B of the recording medium (B) 12 as a key, and the recording medium (B) is re-encrypted. 12, the encrypted watermark information read out and separated from the recording medium (A) 10 is decrypted by the encryption unit 6 using the ID _A of the recording medium (A) 10 as a key, and the watermark is decrypted. and reproducing the information, may be made to the recording medium (B) 12 to encrypt the watermark information reproduced the ID _a and ID _B as a key.

Instead of the encryption, a random number may be generated in the same manner as described in the first embodiment, and the watermark information may be superimposed on the recording data position corresponding to the generated random number.

[0029]

As described above, the watermark information is assigned to the ID.
Is used as a key, and the encrypted watermark information is encoded, superimposed on the recording data, and recorded on the recording medium, so that the watermark information cannot be determined.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the first embodiment.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is an operation flowchart of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buffer memory 2 Watermark information recording part 3 Input part 4, 11 Writing / reading part 5 Digital watermark encoder 6 Encryption part 7 Control part 8 Interface (I / O) 9 Processor (CPU) 10, 12 Recording medium

Claims (11)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing digital information on / from a recording medium, comprising: encrypting means for encrypting watermark information using an ID as a key; and transmitting the watermark information encrypted by the encrypting means to the digital information. An information recording / reproducing apparatus, comprising: encoding means for superimposing on digital information; and recording means for recording digital information on which watermark information encrypted by the encoding means is superimposed on the recording medium. 2. A method according to claim 1, further comprising: generating a random number using an ID as a key instead of said encrypting means; and encoding said watermark information at a position of said digital information corresponding to the random number generated by said random number generating means. Superimposed by means,
2. The information recording / reproducing apparatus according to claim 1, wherein: 3. The apparatus according to claim 2, wherein said encrypting means and said random number generating means are provided so that said watermark information is encrypted and superimposed on a position of said digital information corresponding to the generated random number. 3. The information recording / reproducing device according to 1 or 2. 4. The recording medium according to claim 1, wherein said ID is
4. The information recording / reproducing apparatus according to claim 1, wherein the information recording / reproducing apparatus is D. 5. When copying digital information on which watermark information recorded on a recording medium A is superimposed on a recording medium B, the ID of the recording medium A and the ID of the recording medium B are set to the ID. The information recording / reproducing apparatus according to claim 1, 2 or 3, wherein: 6. The recording medium A has an ID of the recording medium B.
6. The information recording / reproducing apparatus according to claim 5, wherein the information is recorded on a recording medium. 7. The information recording / reproducing apparatus according to claim 6, wherein the ID of the recording medium A is encrypted and recorded on the recording medium B. 8. A recording medium on which watermark information is recorded by being superimposed on digital information, wherein the watermark information is encrypted using an ID as a key.
A recording medium characterized by the above-mentioned. 9. The recording medium according to claim 8, wherein the watermark information is superimposed on a position of the digital information corresponding to a random number generated using an ID as a key. 10. The method according to claim 1, wherein the watermark information is encrypted using an ID as a key, and the encrypted watermark information is superimposed on a position of the digital information corresponding to a random number generated using the ID as a key. Claim 8 or 9
The recording medium according to the above. 11. The recording medium according to claim 8, wherein the ID is an ID assigned to the recording medium.