JP2004063016A - Information recording method, and information recording and reproducing devcice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing device which can enhance convenience of a user while protecting copyright when a plurality of pieces of information to be protected by copyright are reproduced continuously. <P>SOLUTION: In the information recording and reproducing device 1 for recording information recorded in a DVD disk 9A protected by copyright in a hard disk incorporated therein and reproducing the information recorded in the hard disk as necessary, a system control circuit 6A records information in a ciphered state which is recorded in a DVD disk 9A reproduced by a DVD player 2 in a ciphered state when it is recorded in a hard disk of a recording and reproducing device 1, and sets an available period of cipher decoding. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus for recording / reproducing digital data.
[0002]
[Prior art]
In recent years, DVDs (Digital Versatile Discs) have appeared as information recording media, but since information recorded on these is digital information, digital information can be easily copied. For this reason, a copy can be generated without deterioration, and there is a possibility that the right of the copyright holder may be infringed. Therefore, various methods have been conventionally proposed for preventing copy of digital information recorded on an information recording medium such as a DVD.
[0003]
For example, with regard to copy protection in DVD-Video (read only), CSS (Content Scramble System), which is a basic method of copy protection of DVD, has been proposed. The CSS encrypts a digital information using a three-layer encryption technology of a title key (key), a disk key (key), and a device key (key) when recording digital information on a DVD disk as a recording medium, and licenses the license. Only the received CSS-compliant DVD device (player) can decrypt the encrypted digital information and reproduce it.
[0004]
A device key is assigned in advance to a DVD reproducing apparatus that reproduces a DVD disk whose copyright is protected by CSS.
[0005]
That is, the DVD reproducing device reads the encrypted disk key from the DVD disk and decrypts the disk key with the device key to obtain the disk key prior to the reproduction.
[0006]
Next, the encrypted title key recorded on the DVD disk is read, and the title key is decrypted using the disk key as an encryption key to obtain a title key.
[0007]
Next, the encrypted AV content data is read from the DVD disk, descrambled using the title key to decrypt the AV content, and reproduce the AV content recorded on the DVD disk.
[0008]
On the other hand, in recent years, the storage capacity of a hard disk device has been increasing, and the capacity per hard disk has reached several tens of times that of a DVD. For example, as shown in FIG. 9, if a player equipped with a DVD player 102 as a DVD reproducing unit and a hard disk device 101 as an information recording / reproducing unit is used, a single hard disk can be used to store several tens of titles of a DVD disk. Content can be saved.
[0009]
As an application of such a player, for example, if you want to continuously watch titles of a series, if you perform a long time-shift playback such as copying multiple titles to a hard disk and playing back from the hard disk, there is no expensive autochanger But you can watch them continuously without having to change discs on the way.
[0010]
Here, the operation of the apparatus of FIG. 9 will be described in more detail.
[0011]
When viewing a DVD disk as usual, first, when the DVD disk 109 is inserted into the DVD player 102 and the user performs an operation such as pressing a play button, a playback command is sent from the user I / F 105 via the U_IF bus. It is transmitted to the system control circuit 106.
[0012]
The system control circuit 106 that has received the reproduction command transmits an encryption key request command to the DVD player 102 via the D_IF bus. In response to the encryption key request command, the DVD player 102 transmits an encryption key for encrypting the AV content data to the system control circuit 106 via the D_IF bus. The system control circuit 106 that has received the encryption key sets the encryption key in the descrambler 107 via the AV_KEY bus.
[0013]
Subsequently, the system control circuit 106 transmits a playback command of the AV content data to the DVD player 102 via the D_IF bus.
[0014]
In response, the DVD player 102 transmits the encrypted AV content data to the system control circuit 106 via the D_IF bus. Upon receiving the AV content data, the system control circuit 106 transmits the data to the descrambler 107 via the AV_DATA bus.
[0015]
Next, the descrambler 107 decrypts the AV content data input via the AV_DATA bus using the set encryption key, and transmits the decrypted data to the M_IN bus of the video data decompression circuit 108 via the DVA_DATA bus. The moving image data expansion circuit 108 restores the moving image data and the audio data, transmits the respective data to the M_DATA bus of the monitor 110 via the M_OUT bus, and the user views the contents of the DVD disk 109.
[0016]
When recording the AV contents on the DVD disk 109 in the hard disk device 101, when the DVD disk 109 is inserted and the recording button is pressed by the user, a recording command is sent from the user I / F 105 to the system control circuit 106 via the U_IF bus. Is sent.
[0017]
Upon receiving the recording command, the system control circuit 106 transmits an encryption key request command to the DVD player 102 via the D_IF bus.
[0018]
In response to the encryption key request command, the DVD player 102 transmits the encryption key A for encrypting the AV content data to the system control circuit 106 via the D_IF bus.
[0019]
Upon receiving the encryption key A, the system control circuit 106 sets the encryption key A in the descrambler 107 via the AV_KEY bus.
[0020]
Next, the system control circuit 106 transmits a reproduction command to the DVD player 102 via the D_IF bus. In response, the DVD player 102 transmits the AV content data A on the DVD disk 109 to the system control circuit 106 via the D_IF bus.
[0021]
At almost the same time, the system control circuit 106 transmits a recording command to the hard disk device 101 via the H_IF bus, and subsequently transmits recording data. At this time, as the recording data, the decrypted AV content data received from the descrambler 107 via the DAV_DATA bus is transmitted to the hard disk device 101 via the H_IF bus.
[0022]
As a result, the AV content data A on the DVD disk 109 is recorded on the recording medium in the hard disk device 101 in a decrypted state.
[0023]
Subsequently, a case will be described in which the AV content data A recorded in the hard disk device 101 in the decrypted state is reproduced.
[0024]
First, when the user presses a hard disk playback button to instruct playback of the AV content data A on the hard disk device 101, the hard disk playback command is transmitted from the user I / F 105 to the system control circuit 106 via the U_IF bus.
[0025]
The system control circuit 106 that has received the hard disk playback command transmits a playback command for reading the file of the AV content data A to the hard disk device 101 via the H_IF bus. In response to the playback command, the hard disk device 101 transmits the previously recorded AV content data A to the system control circuit 106 via the H_IF bus.
[0026]
The system control circuit 106 sets the input data to the descrambler 107 via the AV_KEY bus so as to output (through output) the data as it is without processing, and the system control circuit 106 sets the AV data transmitted from the hard disk device 101 via the H_IF bus. The content data A is sequentially transmitted to the descrambler 107 via the AV_DATA bus.
[0027]
Since the descrambler 107 is set to the through output, the descrambler 107 directly outputs the AV content data A input via the AV_DATA bus to the moving image data expansion circuit 108 via the DAV_DATA bus.
[0028]
The moving image data decompression circuit 108 decompresses the moving image data and audio compression data input via the M_IN bus and transmits the decompressed data to the M_DATA of the monitor 110 via the M_OUT bus. View the content of 109.
[0029]
[Problems to be solved by the invention]
However, an apparatus such as the apparatus shown in FIG. 9, which can easily make a copy of AV contents on a DVD disk on a hard disk, promotes illegal copying, and from the viewpoint of copyright protection. Actually, there is a problem that it is difficult to manufacture and sell.
[0030]
Further, since the above-described encryption key processing is performed for each DVD disk as in the apparatus shown in FIG. 9, when a plurality of DVD disks are to be continuously reproduced, every time the DVD disks are replaced. In addition, since the above-described processing is performed, a plurality of DVD disks cannot be reproduced without a waiting time, which causes a problem that user convenience is reduced.
[0031]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to protect a copyright while continuously reproducing a plurality of pieces of information to be protected by copyright. It is an object of the present invention to provide an information recording method and an information recording / reproducing apparatus which can improve the convenience of the method.
[0032]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an information recording method according to the present invention is an information recording method for recording information recorded on a first recording medium on a second recording medium, wherein the information is encrypted on the first recording medium. When recording the information recorded in the encrypted state on the second recording medium, the information is recorded in an encrypted state, and the expiration date information for setting the expiration date of the decryption is also recorded. It is characterized by.
[0033]
According to the above configuration, since the information recorded on the second recording medium is recorded in an encrypted state, the information is decrypted in the same manner as the information recorded on the first recording medium. Normal reproduction becomes possible.
[0034]
For example, if information of a plurality of first recording media is recorded on the second recording medium, one second recording medium is reproduced so that the plurality of first recording media are continuously reproduced. It is possible to continuously reproduce the information of each first recording medium from the medium.
[0035]
In addition, when information recorded in an encrypted state on the first recording medium is recorded on the second recording medium, expiration date information for setting an expiration date for decryption is also recorded. Therefore, after the expiration date, the decryption of the encryption cannot be performed, and as a result, the information recorded on the second recording medium cannot be reproduced.
[0036]
Therefore, since the information recorded on the second recording medium cannot be reproduced indefinitely, especially when the information recorded on the first recording medium is information to be protected by copyright, the copyright is protected. The recorded data is recorded on the second recording medium.
[0037]
For example, when a commercially available DVD-video is assumed as the first recording medium and a hard disk having a larger capacity than the above-mentioned DVD-video is assumed as the second recording medium, a plurality of DVD-videos are stored. In the case of recording on one hard disk, the expiration date of decryption is set for each DVD-video, so that within this expiration date, the contents of a plurality of DVD-videos can be continuously reproduced from the hard disk. It becomes possible.
[0038]
In this case, since the data cannot be reproduced after the expiration date, even if the DVD-video is not purchased but borrowed from another person, copying from the DVD-video to the recording / reproducing apparatus is not regarded as unauthorized. The copyright of the DVD-video is protected.
[0039]
For example, if a DVD-video is rented at a rental shop and a rental expiration date is set, once the DVD-video is recorded on the recording / reproducing device, if it is within the expiration date of the decryption, Even if the rental period expires, it becomes possible to reproduce.
[0040]
As described above, according to the above information recording method, when a plurality of pieces of information to be protected by copyright are successively reproduced, the convenience of the user is improved while protecting the copyright. Can be.
[0041]
According to another aspect of the present invention, there is provided an information recording / reproducing apparatus that reproduces information recorded in an encrypted state on a first recording medium, Recording and reproducing means for recording the information recorded on the first recording medium in an encrypted state on the second recording medium, and reproducing the information recorded on the second recording medium as necessary; and An expiration date setting unit for setting an expiration date of decryption of information recorded on the second recording medium; and a method for setting the validity period when the information recorded on the second recording medium is reproduced by the recording / reproducing unit. Expiration date determining means for determining whether or not the expiration date set by the expiration date setting means has been exceeded; and when the expiration date determining means determines that the expiration date has been exceeded, the information is recorded on the second recording medium. Information It is characterized in that a control means for controlling the reproducing means so as not to perform.
[0042]
According to the above configuration, the information recorded on the second recording medium is in an encrypted state, and the expiration date is set for decryption of the cipher. Since the decryption is performed, the information recorded on the second recording medium can be reproduced. However, if the expiration date is exceeded, the encryption of the information recorded on the second recording medium cannot be decrypted. The information recorded on the recording medium cannot be reproduced.
[0043]
As described above, by managing the information recorded in the encrypted state on the second recording medium by the expiration date, the information recorded on the second recording medium can be properly reproduced. . That is, it is possible to perform appropriate authentication on the information recorded on the second recording medium. For example, if the information recorded on the second recording medium is information to be protected by copyright, Since the reproduction of the information is not set indefinitely, the copyright is protected.
[0044]
In addition, information to be reproduced recorded on the first recording medium is temporarily recorded (copied) on the second recording medium, and the copied information is read out. When the second recording medium is a hard disk or the like, high-speed reading can be performed according to the difference in reading performance between the respective playback devices.
[0045]
Here, when the storage capacity of the second recording medium is larger than the storage capacity of the first recording medium and the contents (AV contents) of the plurality of first recording media can be recorded on the second recording medium. Since information is read out from the recording / reproducing means at the time of reproducing information, it is possible to continuously reproduce information between different first recording media as compared with the reproduction from the information reproducing means.
[0046]
As described above, according to the information recording / reproducing apparatus described above, when a plurality of pieces of information to be protected by copyright are successively reproduced, the user's convenience is improved while protecting the copyright. be able to.
[0047]
The setting of the expiration date by the expiration date setting means may be performed as follows.
[0048]
The expiration date setting means may set the expiration date based on an elapsed time from when information of the first recording medium is recorded on the second recording medium.
[0049]
In this case, since the starting point of the expiration date is the time when the information is recorded on the second recording medium, the expiration date can be set according to the date and time information to be recorded on the second recording medium. If the date and time information to be recorded on the second recording medium is repeated, the expiration date can be substantially extended.
[0050]
Further, the expiration date setting means may set the expiration date based on the elapsed time from the first decryption of the information recorded on the second recording medium.
[0051]
In this case, since the reproduction operation is restricted by the expiration date at least after decryption is performed, normal reproduction of information is prohibited due to the expiration date being exceeded without performing reproduction once. Can be eliminated. That is, the expiration date is not counted until the first decryption is performed, so that it is possible to avoid a situation in which the expiration date has passed before the content is reproduced even once.
[0052]
Further, the information recording / reproducing apparatus of the present invention may be configured as follows.
[0053]
That is, in order to solve the above-described problem, information encrypted by the first encryption key and information playback means for playing back information on a first recording medium on which the first encryption key is recorded are provided. Recording / reproducing means for recording encrypted information recorded on a recording medium on a second recording medium, and an expiration date on which the expiration date for decryption of the information recorded on the second recording medium is recorded as date and time information Recording means, date and time information acquisition means for acquiring information about the current date and time, and when a request for information reproduction is generated, date and time information recorded in the expiration date recording means and date and time information acquired from the date and time information acquisition means The expiration date judging means for judging the expiration date by comparing the expiration date and the expiration date judging device judges that the expiration date for decryption of the information recorded on the second recording medium has passed. The case may be configured to include a control means for controlling the reproducing means so as not to play the second encrypted information recorded on the recording medium.
[0054]
An information reproducing means for reproducing the information encrypted by the first encryption key and the information on the first recording medium on which the first encryption key is recorded, and an encrypted information recorded on the first recording medium; Recording / reproducing means for recording the information obtained in the second recording medium in combination with information for specifying the storage location of the encryption key holding means, and specifying the first encryption key read from the first recording medium. And information about the current date and time, and information about the current date and time, and the information recorded on the first recording medium and the date and time information recorded on the second recording medium as a pair. Date and time information acquiring means, when the information recorded on the second recording medium is reproduced by the recording and reproducing means, the date and time information recorded in the encryption key holding means and the date and time information acquired from the date and time information acquiring means; And comparing the second Expiration date judging means for judging the expiration date of the decryption of the information recorded on the recording medium; and, if the date and time information judged by the expiration date judging device falls within the expiration date, the information is encrypted from the first recording medium. Read out the information that specifies the storage location of the first encryption key for decrypting the information and the encrypted key, and reads out the encryption key from the encryption key holding unit based on the information that specifies the storage location of the first encryption key. And control means for controlling the recording / reproducing means so that the encrypted information recorded on the second recording medium is decrypted with the first encryption key.
[0055]
In this case, information such as a video recorded on a first recording medium such as an optical disk is read by an information reproducing means such as a DVD player, and the read information is stored in a second recording medium such as a hard disk by a first encryption key. A recording / reproducing means for recording the data as it is encrypted, a date / time information acquiring means for acquiring information on the current date / time from a timer means or the like; An expiration date judging unit for judging an expiration date by comparing the date and time information obtained from the date and time information acquisition unit with the date and time information obtained from the date and time information obtaining unit. A control unit (system control unit) such as a CPU for prohibiting normal reproduction of information recorded in an encrypted state on the second recording medium.
[0056]
Therefore, when there is a reproduction request for information such as AV content recorded on the second recording medium, if the elapsed time from the recording time is within a predetermined time, normal reproduction of the AV content data is performed. The control means can make a decision to permit and if the time exceeds a predetermined time, invalidate the authentication and prohibit normal reproduction. That is, since the expiration date of the information recorded on the second recording medium in a state of being encrypted with the first encryption key is managed, it is determined whether or not the reproduction request is made within the expiration date. Appropriate authentication can be performed by checking.
[0057]
In addition, information to be reproduced recorded on the first recording medium is temporarily recorded (copied) on the second recording medium, and the copied information is read out. When the second recording medium is a hard disk or the like, high-speed reading can be performed according to the difference in reading performance between the respective playback devices.
[0058]
Here, if the storage capacity of the second recording medium is larger than the storage capacity of the first recording medium and the contents (AV contents) of the plurality of first recording media can be recorded, the information at the time of information reproduction is Is read from the recording / reproducing means, so that information can be continuously reproduced between different first recording media, as compared with the reproduction from the information reproducing means.
[0059]
The encryption key holding means may encrypt and record the first encryption key with a second encryption key on the second recording medium.
[0060]
In this case, since the first encryption key is encrypted by the second encryption key and recorded on the second recording medium, even if the recording medium in the recording / reproducing means is portable, the encryption key of the AV content data is used. There is no danger of outflow.
[0061]
BEST MODE FOR CARRYING OUT THE INVENTION
[Embodiment 1]
An embodiment of the present invention will be described below.
[0062]
FIG. 1 is a block diagram schematically showing an information recording / reproducing apparatus according to the present embodiment.
[0063]
As shown in FIG. 1, the information recording / reproducing device includes a recording / reproducing device 1 as a recording / reproducing device, a DVD player 2 as a DVD reproducing device, a timer device 3 as a timer device, and an encryption key holding circuit as an encryption key holding device. 4. User interface (user I / F) 5, system control circuit (control means, expiration date setting means, expiration date determination means) 6A as system control means, descrambler 7 as decryption means, and moving image data decompression means Moving image data decompression circuit 8. The user watches information (movie or the like) reproduced by the information recording / reproducing apparatus having the above configuration through the monitor 10.
[0064]
The recording / reproducing apparatus 1 and the system control circuit 6A are connected via an HDD_IF bus and an H_IF bus.
[0065]
When data is recorded in the recording / reproducing apparatus 1, the system control circuit 6A sends the recording data to the HDD_IF bus of the recording / reproducing apparatus 1 via the H_IF bus, following the recording command specifying the recording position. Recording data is recorded on a recording medium (such as a hard disk) in the recording / reproducing apparatus 1.
[0066]
When data is reproduced from the recording / reproducing apparatus 1, the system control circuit 6A transmits a reproduction command designating a reproducing position to the HDD_IF bus of the recording / reproducing apparatus 1 via the H_IF bus. Is output to the H_IF bus of the system control circuit 6A.
[0067]
The DVD player 2 and the system control circuit 6A are connected via a D_IF bus.
[0068]
When reproducing data from the DVD player 2, the system control circuit 6A transmits a reproduction command specifying a reproduction position to the DVD player 2 via the D_IF bus, and the DVD player 2 transmits the reproduction command via the D_IF bus. The reproduced data is output to the system control circuit 6A.
[0069]
To obtain an encryption key for descrambling encrypted playback data, the system control circuit A transmits an encryption key request command to the DVD player 2 via the D_IF bus, The player 2 outputs an encryption key to the system control circuit 6A via the D_IF bus.
[0070]
The timer device 3 keeps track of the current time and is connected to the system control circuit 6A via a TM signal line, so that the system control circuit 6A can always acquire the current time.
[0071]
The encryption key holding circuit 4 and the system control circuit 6A are connected via a K_IF bus.
[0072]
When the system control circuit 6A holds the encryption key, the system control circuit 6A transmits the encryption key data to the encryption key holding circuit 4 via the K_IF bus together with the write command indicating the address holding the encryption key. The encryption key data is held at the corresponding address.
[0073]
When the system control circuit 6A wants to acquire the held encryption key, the read command indicating the address where the encryption key is held is transmitted to the encryption key holding circuit 4 via the K_IF bus, and the corresponding address is obtained. The held encryption key data is transmitted to the system control circuit 6A.
[0074]
As the encryption key holding circuit 4, for example, as shown in FIG. In this case, when a write command is received from the K_IF bus, the command processing circuit 22 analyzes the input command and analyzes the address (ADR), data (DATA), and read / write control signal (W / R) of the semiconductor memory 21. When the received command is written to the semiconductor memory 21 and a read command is received from the K_IF bus, the command processing circuit 22 analyzes the input command and analyzes the address (ADR) and data (DATA) of the semiconductor memory 21. It controls the read / write control signal (W / R) and outputs data read from the semiconductor memory 21 to the K_IF bus.
[0075]
Since the power supply of the semiconductor memory 21 is secured by the battery 23 provided separately from the power supply of the apparatus, the stored contents are not lost even if the power supply of the apparatus is turned off.
[0076]
The user I / F 5 and the system control circuit 6A are connected via a U_IF bus.
[0077]
A DVD playback command, a time-shift recording command, and a time-shift playback command, which will be described later, are transmitted from the user I / F 5 to the system control circuit 6A via the U_IF bus. The system control circuit 6A controls a series of operations according to these commands. The control operation of the system control circuit 6A will be described later.
[0078]
The descrambler 7 and the system control circuit 6A are connected via an AV_KEY bus and an AV_DATA bus.
[0079]
The system control circuit 6A transmits a command for setting an encryption key to the descrambler 7 via the AV_KEY bus, and sets the encryption key in the descrambler 7.
[0080]
The descrambler 7 uses the encryption key set based on the command transmitted from the system control circuit 6A via the AV_KEY bus to encrypt the data included in the data transmitted from the system control circuit 6A via the AV_DATA bus. The data is decrypted and transmitted to the subsequent moving image data expansion circuit 8 via the DAV_DATA bus.
[0081]
It is described that the encrypted data is transmitted to the descrambler 7 from the AV_DATA bus of the system control circuit 6A, and the encrypted data is received by the AV_DATA of the descrambler 7. You can switch data. That is, data obtained from the recording / reproducing apparatus 1 and data obtained from the DVD player 2 are switched from the AV_DATA bus of the system control circuit 6A and transmitted to the descrambler 7.
[0082]
FIG. 3 shows a configuration example of the descrambler 7.
[0083]
The descrambler 7 performs the same processing as the encryption process. As shown in FIG. 3, the random number generation shift register 31, parallel-serial converter 32, Ex-OR operator 33, serial-parallel converter 34 Consists of
[0084]
The encryption key data set via the AV_KEY bus is loaded as an initial value into the random number generation shift register 31, and the parallel data input via the AV_DATA bus is converted into serial data by the parallel-serial converter 32. . The exclusive-OR operation is performed on the output of the random number generation shift register 31 and the output of the parallel-serial converter 32 by the Ex-OR operator 33, and the code is decrypted. Further, the decrypted serial data is again converted into parallel data by the serial-parallel converter 34 and transmitted to the subsequent moving image data expansion circuit 8 via the DAV_DATA bus.
[0085]
As shown in FIG. 1, the moving image data expansion circuit 8 receives parallel data transmitted through the DAV_DATA bus of the descrambler 7 through the M_IN bus. Since the parallel data received at this time is compressed moving image data, the moving image data expansion circuit 8 expands the moving image data and restores it to data that can be displayed on the monitor 10, and the data is transmitted via the M_OUT bus. This is transmitted to M_DATA of the monitor 10 at the subsequent stage.
[0086]
The operation of the information recording / reproducing apparatus having the above configuration will be described in detail with reference to FIG.
[0087]
First, a case where the information recording / reproducing apparatus views a DVD as usual will be described below. Here, as the DVD, for example, a DVD-Video (read only), which employs a CSS (Content Scramble System), which is a basic method for preventing copy of a DVD, is used. For convenience of description, DVD-Video is referred to as a DVD disk.
[0088]
First, when the DVD disk 9A is inserted into the DVD player 2 and the user performs an operation such as pressing a play button (not shown), a play command is transmitted from the user I / F 5 to the system control circuit 6A via the U_IF bus. Is done.
[0089]
The system control circuit 6A that has received the reproduction command transmits an encryption key request command to the DVD player 2 via the D_IF bus. In response to the command, the DVD player 2 transmits an encryption key for encrypting the AV content data to the system control circuit 6A via the D_IF bus. The system control circuit 6A that has received the encryption key transmits a command for setting the encryption key to the descrambler 7 via the AV_KEY bus, and sets the encryption key in the descrambler 7.
[0090]
Subsequently, the system control circuit 6A transmits a playback command of the AV content data to the DVD player 2 via the D_IF bus.
[0091]
In response, the DVD player 2 transmits the encrypted AV content data to the system control circuit 6A via the D_IF bus. The system control circuit 6A that has received the AV content data transmits the data to the descrambler 7 via the AV_DATA bus.
[0092]
Next, the descrambler 7 decrypts the AV content data received via the AV_DATA bus using the set encryption key, and transmits the decrypted data to the M_IN bus of the moving picture data expansion circuit 8 via the DAV_DATA bus.
[0093]
The moving image data expansion circuit 8 restores the received data into moving image data and audio data, and transmits these data to the M_DATA bus of the monitor 10 via the M_OUT bus.
[0094]
The monitor 10 outputs moving image data and audio data received via the M_DATA bus.
[0095]
By outputting the content of the DVD 9A to the monitor 10 in this manner, the user views the content of the DVD 9A.
[0096]
Subsequently, when the user has finished watching the DVD 9A and wishes to continue watching the DVD 9B, the user ejects the DVD 9A from the DVD player 2, inserts the DVD 9B, and performs the above-described reproduction operation. Will be repeated.
[0097]
By the way, when watching the DVD disks 9A and 9B continuously, the above-described decryption processing is performed for each DVD disk. Therefore, after one DVD disk has been viewed, the next DVD disk 9A and 9B are viewed. A problem that the time required to view the movie becomes very long.
[0098]
For example, if the AV contents (for example, movies) of each DVD disc are completely different (not a series), there is not much problem, but if the AV contents of each DVD disc are closely related (such as a series of movies). In many cases, the user wants to watch continuously, so as described above, when it takes a long time from the end of viewing one DVD disc to the next DVD disc. Is a problem.
[0099]
Therefore, in order to solve such a problem, in the present embodiment, the AV content of each DVD disc is recorded together with the encryption key on a recording medium (here, a recording / reproducing device) larger than the capacity of the DVD disc. Has proposed a method of continuously reproducing AV contents.
[0100]
In this case, simply recording the AV contents of the DVD disk in the recording / reproducing apparatus would illegally copy the AV contents of the contents whose copyright should be protected. The AV content recorded on the recording / reproducing device cannot be reproduced after a lapse of a predetermined time from the recording on the recording / reproducing device. Recording the AV content whose copyright is to be protected on the recording / reproducing apparatus in such a manner that it cannot be reproduced after a predetermined time in this way means that the copyright has been protected because it is not illegally copied. .
[0101]
As described above, a function of once recording information on a DVD disk in a recording / reproducing device such as a hard disk device and then reproducing the information recorded in the recording / reproducing device is referred to as a time shift function.
[0102]
The time shift function in the information recording / reproducing apparatus having the above configuration will be described below. This time shift function is roughly divided into two operations.
[0103]
That is, the first operation is to record data on a medium such as a DVD disk in a time-shifted memory (the recording / reproducing apparatus 1 in the present embodiment) in an encrypted state, and at the same time, to use an encryption key for decryption. The second operation is a time-shift recording operation for retaining data, and the second operation is a time-shift reproducing operation for reproducing data recorded in the time-shift memory by the time-shift recording operation.
Hereinafter, each will be described in detail.
[0104]
First, the time shift recording operation will be described below.
[0105]
When the DVD disk 9A is inserted and the time shift recording button is pressed by the user, a time shift recording command is transmitted from the user I / F 5 to the system control circuit 6A via the U_IF bus.
[0106]
The system control circuit 6A that has received the time shift recording command transmits an encryption key request command to the DVD player 2 via the D_IF bus. In response to the command, the DVD player 2 transmits an encryption key A for encrypting the AV content data to the system control circuit 6A via the D_IF bus.
[0107]
Upon receiving the encryption key A, the system control circuit 6A generates the time stamp data A (expiration date) based on the current time kept by the timer device 3, and generates the encryption key A by pairing the encryption key A and the time stamp data A. A write command for holding the key data A in an empty address of the encryption key holding circuit 4 is transmitted to the encryption key holding circuit 4 via the K_IF bus. Here, as shown in FIG. 4, for example, there are addresses 0 to 99 in total, and when addresses 0 to 06 have already been used, the encryption key A and the time stamp are added to the vacant address 07. It is assumed that encryption key data A paired with data A is held.
[0108]
Next, the system control circuit 6A transmits a reproduction command to the DVD player 2 via the D_IF bus. In response, the DVD player 2 transmits the AV content data A on the DVD disk 9A to the system control circuit 6A via the D_IF bus.
[0109]
At almost the same time, the system control circuit 6A transmits a recording command to the recording / reproducing apparatus 1 via the H_IF bus, and subsequently transmits recording data. At this time, as shown in FIG. 5A, the address of the encryption key holding circuit 4 where the encryption key data A is held at the beginning of the AV content data A received from the DVD player 2 as shown in FIG. In the embodiment, “07”) is added and transmitted.
[0110]
As a result, the AV content data A on the DVD disk 9A is recorded on the recording medium in the recording / reproducing apparatus 1 in an encrypted state.
[0111]
Next, when the DVD disk 9A is ejected and the DVD disk 9B is inserted and time shift recording is instructed by the user I / F 5, similarly, the time shift is performed from the user I / F 5 to the system control circuit 6A via the U_IF bus. A recording command is sent.
[0112]
The system control circuit 6A that has received the time shift recording command transmits an encryption key request command to the DVD player 2 via the D_IF bus. In response to the command, the DVD player 2 transmits an encryption key B for encrypting the AV content data to the system control circuit 6A via the D_IF bus.
[0113]
Upon receiving the encryption key B, the system control circuit 6A generates time stamp data B (expiration date) from the current time counted by the timer device 3, and generates the encryption key data obtained by pairing the encryption key B and the time stamp data B. A write command for holding B in an empty address of the encryption key holding circuit 4 is transmitted to the encryption key holding circuit 4 via the K_IF bus. Here, since the addresses from 00 to 07 are already used, the encryption key data B in which the encryption key B and the time stamp data B are paired is held at the address 08 as shown in FIG.
[0114]
Next, the system control circuit 6A transmits a reproduction command to the DVD player 2 via the D_IF bus. In response, the DVD player 2 transmits the AV content data B on the DVD 9B to the system control circuit 6A via the D_IF bus.
[0115]
At almost the same time, the system control circuit 6A transmits a recording command to the recording / reproducing apparatus 1 via the H_IF bus, and subsequently transmits recording data. At this time, as shown in FIG. 5B, the address of the encryption key holding circuit 4 (“08” in the present embodiment) is added to the head of the AV content data B received from the DVD player 2 as the recording data. Add and send.
[0116]
As a result, the AV content data B on the DVD disk 9B is recorded on the recording medium in the recording / reproducing apparatus 1 in an encrypted state.
[0117]
Next, the time shift reproduction operation will be described below. Here, a case where the recorded AV content data A and B are continuously reproduced by the above-described time shift recording operation will be described.
[0118]
First, when the user presses a time-shift reproduction button (not shown) to instruct continuous reproduction of the AV content data A and the AV content data B, the user I / F 5 transmits the two time-shift recorded data (AV A time shift reproduction command requesting continuous reproduction of the content data A and the AV content data B) is transmitted to the system control circuit 6A via the U_IF bus.
[0119]
The system control circuit 6A that has received the time shift reproduction command transmits a reproduction command requesting reading of a file of the AV content data A to the recording / reproducing apparatus 1 via the H_IF bus. In response to the playback command, the recording and playback apparatus 1 transmits the previously recorded AV content data A to the system control circuit 6A via the H_IF bus.
[0120]
The system control circuit 6A analyzes the head of the AV content data A to obtain the address of the encryption key holding circuit 4 (07 in the present embodiment), and sends the address (07) to the encryption key holding circuit 4 via the K_IF bus. Address) is transmitted. In response to the read command, the encryption key holding circuit 4 transmits the encryption key A and the time stamp data A held at the designated address (address 07) to the system control circuit 6A via the K_IF bus.
[0121]
The system control circuit 6A acquires the encryption key A and the time stamp data A from the encryption key holding circuit 4 via the K_IF bus, and further acquires the current time from the timer device 3 via the TM bus.
[0122]
The system control circuit 6A determines whether or not the difference between the time stamp data A and the current time has exceeded a predetermined time, and if so, notifies the user I / F 5 via the U_IF bus that the time is over. To send a signal.
[0123]
The user I / F 5 that has received the signal notifying the time over displays the fact on a display device (not shown) to notify the user.
[0124]
On the other hand, when it is determined that the difference between the time stamp data A and the current time is within the predetermined time, the system control circuit 6A transmits the encryption key A to the descrambler 7 via the AV_KEY bus, and sets the encryption key A in the descrambler 7. Then, the recording / reproducing apparatus 1 removes the encryption key address data (07) at the head from the AV content data A transmitted via the H_IF bus, and sequentially transmits the data to the descrambler 7 via the AV_DATA bus.
[0125]
The descrambler 7 decrypts the AV content data A input via the AV_DATA bus using the set encryption key A, and transmits the decrypted compressed data to the M_IN bus of the moving picture data expansion circuit 8 via the DAV_DATA bus.
[0126]
Subsequently, the moving image data expansion circuit 8 expands the compressed data (moving image compressed data and audio compressed data) input via the M_IN bus and transmits the expanded data to the M_DATA bus of the monitor 10 via the M_OUT bus.
[0127]
When the reproduction of the AV content data A is completed in this way, the system control circuit 6A subsequently transmits a reproduction command for reading the data of the AV content data B to the recording / reproducing apparatus 1 via the H_IF bus. In response to the reproduction command, the recording / reproducing apparatus 1 transmits the previously recorded AV content data B to the system control circuit 6A via the H_IF bus.
[0128]
The system control circuit 6A analyzes the head of the received AV content data B to obtain an encryption key address (08 in the present embodiment), and sends the obtained encryption key address to the encryption key holding circuit 4 via the K_IF bus. Send a read command to read data. In response to the read command, the encryption key holding circuit 4 transmits the encryption key B and the time stamp data B held at the designated address (address 08) to the system control circuit 6A via the K_IF bus.
[0129]
The system control circuit 6A acquires the encryption key B and the time stamp data B from the encryption key holding circuit 4 via the K_IF bus, and further acquires the current time from the timer device 3 via the TM bus.
[0130]
The system control circuit 6A compares the time stamp data B with the current time, and if the difference exceeds a predetermined time, notifies the user I / F 5 via the U_IF bus that the time is over, as described above. To send a signal.
[0131]
The user I / F 5 that has received the signal notifying the time over displays the fact on a display device (not shown) to notify the user.
[0132]
On the other hand, the time stamp data B is compared with the current time, and if the difference is within a predetermined time, the encryption key B is transmitted to the descrambler 7 via the AV_KEY bus, set in the descrambler 7, and set for recording and reproduction. The device 1 removes the leading encryption key address data (08) from the AV content data B transmitted via the H_IF bus, and sequentially transmits the data to the descrambler 7 via the AV_DATA bus.
[0133]
The descrambler 7 decrypts the AV content data B input from the system control circuit 6A via the AV_DATA bus using the set encryption key B, and transmits the decrypted AV content data B to the M_IN bus of the moving picture data expansion circuit 8 via the DAV_DATA bus.
[0134]
Subsequently, the moving image data expansion circuit 8 expands the compressed data (moving image compressed data and audio compressed data) input from the descrambler 7 via the M_IN bus, and transmits the compressed data to the M_DATA bus of the monitor 10 via the M_OUT bus.
[0135]
According to the above-described operation, the user can continuously and seamlessly watch the AV contents of the DVD 9A and the DVD 9B during the valid period.
[0136]
In the time shift recording operation, if the AV content data has already been recorded in the recording / reproducing apparatus 1, only the operation of holding the encryption key data is performed. This operation is equivalent to the fact that the original DVD disk is used as the authentication means in order to reproduce the data on the recording / reproducing apparatus 1 based on the DVD disk, and the authentication is lost after a predetermined time has elapsed. It indicates that there is.
[0137]
[Embodiment 2]
The following will describe another embodiment of the present invention. The members having the same functions as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0138]
FIG. 6 is a schematic block diagram of the information recording / reproducing apparatus according to the present embodiment.
[0139]
As shown in FIG. 6, the information recording / reproducing device according to the present embodiment includes a recording / reproducing device 1, a DVD player 2, a timer device 3, a user I / F 5, a descrambler 7, and a moving image data expansion circuit 8. This is the same as the information recording / reproducing apparatus of the first embodiment (FIG. 1), except that it has a system control circuit (expiration date setting unit, expiration date determining unit) 6B and a scrambler 11. That is.
[0140]
Further, in the information recording / reproducing apparatus, the encryption key holding means in the first embodiment is realized by the recording / reproducing apparatus 1.
[0141]
However, when the encryption key and the time stamp data (expiration date) are recorded in the recording / reproducing apparatus 1 as they are as in the first embodiment, the recording medium in the recording / reproducing apparatus 1 is not portable. Since the encryption key of the AV content data may leak out, and if the apparatus is constructed on a personal computer, it may be read by other software, which is not preferable from the viewpoint of copyright protection. .
[0142]
Therefore, in addition to the functions of the first embodiment, a K_KEY output (bus), a K_DATA output (bus), and an SK_DATA input (bus) are added to the system control circuit 6B provided in the information recording / reproducing apparatus according to the present embodiment. ) Are connected to the scrambler 11 respectively.
[0143]
The scrambler 11 encrypts data input via the K_DATA bus using the encryption key α set from the system control circuit 6B via the K_KEY bus, and transmits the data again to the system control circuit 6B via the SK_DATA bus. Has become.
[0144]
FIG. 7 shows a specific example of the scrambler 11.
[0145]
The scrambler 11 includes a random number generation shift register 31, a parallel-serial converter 32, an Ex-OR operator 33, and a serial-parallel converter 34, as shown in FIG. That is, in the scrambler 11, the encryption key data set from the system control circuit 6B via the K_KEY bus is loaded as an initial value into the random number generation shift register 31, and the data input from the system control circuit 6B via the K_DATA bus is The data is converted into serial data by the parallel-serial converter 32. An exclusive-OR operation is performed on the output of the random number generation shift register 31 and the output of the parallel-serial converter 32 by an Ex-OR calculator 33, encryption is performed, and the encrypted serial data is serial-parallel. The data is again converted into parallel data by the converter 34 and transmitted to the system control circuit 6B via the SK_DATA bus.
[0146]
The scrambler 11 also has a function of decrypting the encryption. If data encrypted with the encryption key α is input from the system control circuit 6B via the K_DATA bus, the decrypted data is transmitted via the SK_DATA bus. This is transmitted to the system control circuit 6B.
[0147]
Therefore, if the system control circuit 6B sets the encryption key α to the scrambler 11 via the K_KEY bus and transmits the data to be encrypted to the scrambler 11 via the K_DATA bus, the data is encrypted from the scrambler 11 via the SK_DATA. Data can be obtained.
[0148]
The operation of this information recording / reproducing apparatus is almost the same as that of the first embodiment described above. Therefore, also in the present embodiment, similarly to the first embodiment, the information recording / reproducing apparatus has a time shift function including two operations (time shift recording operation and time shift reproducing operation).
[0149]
In this embodiment, at the time of the time shift recording operation, an encryption key obtained by pairing the encryption key A (encryption key B) obtained from the DVD player 2 with the time stamp data A (time stamp data B) obtained from the timer device 3. The operation when retaining data A (encryption key data B) is different from that in the first embodiment.
[0150]
That is, in the present embodiment, the encryption key data A (encryption key data B) is encrypted by the scrambler 11 and then recorded on the recording / reproducing apparatus 1. At this time, the system control circuit 6B sets a predetermined encryption key α in the scrambler 11 via the K_KEY bus in advance, and performs the encryption key data via the K_DATA bus at the time of the encryption key holding operation in the later time shift recording operation. A (encryption key data B) is transmitted to obtain encrypted encryption key data A (encryption key data B) from the scrambler 11 via the SK_DATA bus.
[0151]
Subsequently, the encryption key data A (encryption key data B) encrypted by transmitting the recording command to the recording / reproducing apparatus 1 is stored in a recording medium in the recording / reproducing apparatus 1 with a file name of, for example, “KEY_FILEA (KEY_FILEB). ) ".
[0152]
Furthermore, when recording AV content data A (AV content data B) on a recording medium in the recording / reproducing apparatus 1, as shown in FIG. 5C and FIG. A character string “KEY_FILEA (KEY_FILEB)” representing a file name holding the key data A (encryption key data B) is added and recorded.
[0153]
Also, the operation of acquiring the encryption key data A (encryption key data B) during the time shift reproduction operation is different from that of the first embodiment.
[0154]
That is, in the present embodiment, the system control circuit 6B analyzes the head portion of the AV content data A (AV content data B) at the same time as reproducing the AV content data A, acquires the file name: “KEY_FILEA (KEY_FILEB)”, and performs recording / reproduction. A file having a file name: “KEY_FILEA (KEY_FILEB)” is reproduced from the device 1 to obtain encrypted key data A (key key data B) in an encrypted state.
[0155]
Subsequently, the system control circuit 6B transmits the encrypted encryption key data A (encryption key data B) to the scrambler 11 via the K_DATA bus and encrypts the encrypted encryption key data A (encryption key data B) from the scrambler 11 via the SK_DATA bus. Decrypted encryption key data A (encryption key data B) is obtained.
[0156]
In the above description, if the encryption key α is configured to be known only by the system control circuit 6B, the encryption key data A and the encryption key data B may be obtained when the recording medium of the recording / reproducing apparatus 1 is taken out and analyzed, or by other software. Even if it is read, the encryption key data A and the encryption key data B cannot be used as they are because they are encrypted, and the copyright is secured.
[0157]
In the above embodiment, since the time stamp data at the time when the encryption key is held is held as a pair, the expiration time of the time shift reproduction is determined by the elapsed time from the time when the time shift recording operation is performed. Decided. In this case, even if the user has not performed the time-shift reproduction even once after performing the time-shift recording operation, the expiration date of the time-shift reproduction expires after a predetermined time has elapsed.
[0158]
Therefore, in the following third embodiment, an example will be described in which the above problem can be solved by holding time stamp data at the time of first time shift reproduction.
[0159]
[Embodiment 3]
The following is a description of still another embodiment of the present invention. The configuration of the information recording / reproducing apparatus for realizing the present embodiment may be any of the first and second embodiments, and a detailed description thereof will be omitted.
[0160]
In the information recording / reproducing apparatus according to the present embodiment, the expiration date is not set for the first time-shift reproduction, and the time stamp data and the current time are compared with each other at the time of the second or later time-shift reproduction, and a predetermined time or more has elapsed. If the user does not perform the time-shift reproduction even if the user does not perform the time-shift reproduction until a predetermined time (time when the time-shift reproduction cannot be performed) elapses after the user performs the time-shift recording operation. Shift reproduction can be performed. That is, it is possible to avoid a situation in which time-shift recorded AV content data that has never been reproduced cannot be reproduced.
[0161]
As described above, the configuration of the information recording / reproducing apparatus according to the present embodiment is the same as that of the first embodiment or the second embodiment, and here, for convenience of explanation, the description of the first embodiment will be used. With reference to FIG. 1 used, only different portions will be extracted and described.
[0162]
In the information recording / reproducing apparatus shown in FIG. 1, when the system control circuit 6A generates the encryption key data A (encryption key data B) for time shift recording, the system control circuit 6A converts the time stamp data without acquiring the current time. Embodiment 4 differs from Embodiment 1 in that the encryption key data A (encryption key data B) is generated by setting all bits to 0.
[0163]
When performing time-shift reproduction, the system control circuit 6A acquires the encryption key data A (encryption key data B), and when comparing with the current time, the time stamp data A (time stamp data B) is all 0. Is determined to be the first reproduction, the time shift reproduction is continued, the current time is obtained from the timer device 3, the time stamp data A '(time stamp data B') is obtained, and the encryption key A ( The encryption key data A ′ (encryption key data B ′) is generated in combination with the encryption key B), and is recorded at the address 07 (address 08) of the encryption key holding circuit 4.
[0164]
By these operations, an expiration date is not provided only at the time of the first reproduction, and an operation of performing reproduction after judging the expiration date at the second and subsequent reproductions can be performed.
[0165]
In the above embodiments, each means is described as hardware. However, even if a part is made into software using a personal computer or the like, it does not depart from the gist of the present invention.
[0166]
For example, in the information recording / reproducing device as shown in FIG. 8, the user I / F 5 is a keyboard, a mouse, a display, etc., the recording / reproducing device 1 is a hard disk device, the DVD player 2 is a DVD-ROM drive, and The timer device 3 includes a real-time clock IC mounted on a motherboard of a personal computer.
[0167]
Further, the system control circuit 6B, the descrambler 7, the moving image data decompression circuit 8, and the scrambler 11 are implemented as program codes executed by a CPU and a memory.
[0168]
As described above, according to the information recording / reproducing apparatus of the present invention, a long-time continuous time-shift reproduction can be performed by temporarily storing information in the recording / reproducing apparatus. Since the expiration date is set for decryption, it is possible to improve user convenience such as continuous reproduction of a plurality of titles while protecting copyright.
[0169]
Another object of the present invention is to provide a system or an apparatus with a recording medium in which a program code, which is software for realizing the above-described functions, is readable by a computer, and the computer (or CPU or MPU) of the system or the apparatus is provided. Can also be achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the above-described function, and the storage medium storing the program code constitutes the present invention. Examples of the storage medium for supplying the program code include a medium such as a flexible disk, a hard disk, a magnetic tape, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, an MD, and a nonvolatile memory card. A memory such as a ROM or a RAM can be used.
[0170]
The functions described above are not only realized by executing the above-described program code read by a computer, but also executed by an OS or the like running on the computer based on an instruction of the program code. It is also realized by performing all or part of the processing.
[0171]
Further, the above-described function is realized by writing the program code read from the storage medium into a memory provided in a function expansion board or a function expansion unit connected to the computer. Based on the instruction, a CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing, and is also realized by the processing.
[0172]
The content stored in the storage medium is not limited to a program, but may be data.
[0173]
【The invention's effect】
As described above, according to the information recording method of the present invention, in the information recording method of recording information recorded on the first recording medium on the second recording medium, the information recorded on the first recording medium is encrypted. When the recorded information is recorded on the second recording medium, the information is recorded in an encrypted state, and the expiration date information for setting the expiration date for decryption is also recorded.
[0174]
Therefore, since the information recorded on the second recording medium is recorded in an encrypted state, the information is normally reproduced by decrypting the same information as the information recorded on the first recording medium. It becomes possible.
[0175]
For example, if information of a plurality of first recording media is recorded on the second recording medium, one second recording medium is reproduced so that the plurality of first recording media are continuously reproduced. It is possible to continuously reproduce the information of each first recording medium from the medium.
[0176]
In addition, when information recorded in an encrypted state on the first recording medium is recorded on the second recording medium, expiration date information for setting an expiration date for decryption is also recorded. Therefore, after the expiration date, the decryption of the encryption cannot be performed, and as a result, the information recorded on the second recording medium cannot be reproduced.
[0177]
Therefore, since the information recorded on the second recording medium cannot be reproduced indefinitely, especially when the information recorded on the first recording medium is information to be protected by copyright, the copyright is protected. The recorded data is recorded on the second recording medium.
[0178]
For example, when a commercially available DVD-video is assumed as the first recording medium and a hard disk having a larger capacity than the above-mentioned DVD-video is assumed as the second recording medium, a plurality of DVD-videos are stored. In the case of recording on one hard disk, the expiration date of decryption is set for each DVD-video, so that within this expiration date, the contents of a plurality of DVD-videos can be continuously reproduced from the hard disk. It becomes possible.
[0179]
In this case, since the data cannot be reproduced after the expiration date, even if the DVD-video is not purchased but borrowed from another person, copying from the DVD-video to the recording / reproducing apparatus is not regarded as unauthorized. The copyright of the DVD-video is protected.
[0180]
If the DVD-video is borrowed from a rental shop and the rental period is set, the DVD-video may be once recorded in the recording / reproducing device, and if it is within the expiration date of the decryption, Even if the rental period expires, it becomes possible to reproduce.
[0181]
As described above, according to the above information recording method, when a plurality of pieces of information to be protected by copyright are successively reproduced, the convenience of the user is improved while protecting the copyright. This has the effect that it can be performed.
[0182]
Further, as described above, the information recording / reproducing apparatus of the present invention comprises: an information reproducing means for reproducing information recorded in an encrypted state on a first recording medium; and a first information reproducing means for reproducing the information reproduced by the information reproducing means. Recording / reproducing means for recording information recorded on the second recording medium in an encrypted state on the second recording medium, and reproducing the information recorded on the second recording medium as necessary; Expiration date setting means for setting an expiration date for decryption of information recorded on the recording medium, and when the information recorded on the second recording medium is reproduced by the recording / reproducing means, Expiration date judging means for judging whether or not the set expiration date has passed; and when the expiration date judgment unit judges that the expiration date has passed, reproduction of information recorded on the second recording medium is performed. Do not A configuration in which a control means for controlling sea urchin said recording and reproducing means.
[0183]
Therefore, the information recorded on the second recording medium is in an encrypted state, and the expiration date is set for the decryption of the information. Therefore, the information recorded on the second recording medium can be reproduced. However, if the expiration date is exceeded, the information recorded on the second recording medium cannot be decrypted. The recorded information cannot be reproduced.
[0184]
As described above, by managing the information recorded in the encrypted state on the second recording medium by the expiration date, the information recorded on the second recording medium can be properly reproduced. . That is, it is possible to perform appropriate authentication on the information recorded on the second recording medium. For example, if the information recorded on the second recording medium is information to be protected by copyright, Since the reproduction of the information is not set indefinitely, the copyright is protected.
[0185]
In addition, information to be reproduced recorded on the first recording medium is temporarily recorded (copied) on the second recording medium, and the copied information is read out. When the second recording medium is a hard disk or the like, high-speed reading can be performed according to the difference in reading performance between the respective playback devices.
[0186]
Here, when the storage capacity of the second recording medium is larger than the storage capacity of the first recording medium and the contents (AV contents) of the plurality of first recording media can be recorded on the second recording medium. Since information is read out from the recording / reproducing means at the time of reproducing information, it is possible to continuously reproduce information between different first recording media as compared with the reproduction from the information reproducing means.
[0187]
As described above, according to the information recording / reproducing apparatus described above, when a plurality of pieces of information to be protected by copyright are successively reproduced, the user's convenience is improved while protecting the copyright. It has the effect of being able to.
[0188]
The determination of the expiration date by the expiration date determining means may be performed as follows.
[0189]
The expiration date judging means may judge the expiration date based on an elapsed time from when information of the first recording medium is recorded on the second recording medium.
[0190]
In this case, since the starting point of the expiration date is the time when the information is recorded on the second recording medium, the expiration date can be set according to the date and time information to be recorded on the second recording medium. If the date and time information to be recorded on the second recording medium is re-performed, it is possible to effectively extend the expiration date.
[0191]
Further, the expiration date determining means may determine the expiration date based on the elapsed time from the first decryption of the information recorded on the second recording medium.
[0192]
In this case, since the reproduction operation is restricted by the expiration date at least after the decryption is performed, normal reproduction of the information is prohibited by the expiration of the expiration date without performing the time shift reproduction once. Can be eliminated. That is, the expiration date is not counted until the first decryption is performed, so that it is possible to avoid a situation in which the expiration date expires before the content is reproduced even once.
[0193]
Further, the information recording / reproducing apparatus of the present invention may be configured as follows.
[0194]
That is, in order to solve the above-described problem, information encrypted by the first encryption key and information playback means for playing back information on a first recording medium on which the first encryption key is recorded are provided. Recording / reproducing means for recording encrypted information recorded on a recording medium on a second recording medium, and an expiration date on which the expiration date for decryption of the information recorded on the second recording medium is recorded as date and time information Recording means, date and time information acquisition means for acquiring information about the current date and time, and when a request for information reproduction is generated, date and time information recorded in the expiration date recording means and date and time information acquired from the date and time information acquisition means The expiration date judging means for judging the expiration date by comparing the expiration date and the expiration date judging device judges that the expiration date for decryption of the information recorded on the second recording medium has passed. The case may be configured to include a control means for controlling the reproducing means so as not to play the second encrypted information recorded on the recording medium.
[0195]
An information reproducing means for reproducing the information encrypted by the first encryption key and the information on the first recording medium on which the first encryption key is recorded, and an encrypted information recorded on the first recording medium; Recording / reproducing means for recording the information obtained in the second recording medium in combination with information for specifying the storage location of the encryption key holding means, and specifying the first encryption key read from the first recording medium. And information about the current date and time, and information about the current date and time, and the information recorded on the first recording medium and the date and time information recorded on the second recording medium as a pair. Date and time information acquiring means, when the information recorded on the second recording medium is reproduced by the recording and reproducing means, the date and time information recorded in the encryption key holding means and the date and time information acquired from the date and time information acquiring means; And comparing the second Expiration date judging means for judging the expiration date of the decryption of the information recorded on the recording medium; and, if the date and time information judged by the expiration date judging device falls within the expiration date, the information is encrypted from the first recording medium. Read out the information that specifies the storage location of the first encryption key for decrypting the information and the encrypted key, and reads out the encryption key from the encryption key holding unit based on the information that specifies the storage location of the first encryption key. And control means for controlling the recording / reproducing means so that the encrypted information recorded on the second recording medium is decrypted with the first encryption key.
[0196]
In this case, information such as a video recorded on a first recording medium such as an optical disk is read by an information reproducing means such as a DVD player, and the read information is stored in a second recording medium such as a hard disk by a first encryption key. A recording / reproducing means for recording the data as it is encrypted, a date / time information acquiring means for acquiring information on the current date / time from a timer means or the like; An expiration date judging unit for judging an expiration date by comparing the date and time information obtained from the date and time information acquisition unit with the date and time information obtained from the date and time information obtaining unit. A control unit (system control unit) such as a CPU for prohibiting normal reproduction of information recorded in an encrypted state on the second recording medium.
[0197]
Therefore, when there is a reproduction request for information such as AV content recorded on the second recording medium, if the elapsed time from the recording time is within a predetermined time, normal reproduction of the AV content data is performed. The control means can make a decision to permit and if the time exceeds a predetermined time, invalidate the authentication and prohibit normal reproduction. That is, since the expiration date of the information recorded on the second recording medium in a state of being encrypted with the first encryption key is managed, it is determined whether or not the reproduction request is made within the expiration date. Appropriate authentication can be performed by checking.
[0198]
In addition, information to be reproduced recorded on the first recording medium is temporarily recorded (copied) on the second recording medium, and the copied information is read out. When the second recording medium is a hard disk or the like, high-speed reading can be performed according to the difference in reading performance between the respective playback devices.
[0199]
Here, if the storage capacity of the second recording medium is larger than the storage capacity of the first recording medium and the contents (AV contents) of a plurality of first recording media can be recorded, the information at the time of reproducing the information Is read from the recording / reproducing means, so that it is possible to continuously reproduce information between different first recording media as compared with the reproduction from the information reproducing means.
[0200]
The encryption key holding means may encrypt and record the first encryption key with a second encryption key on the second recording medium.
[0201]
In this case, since the first encryption key is encrypted by the second encryption key and recorded on the second recording medium, even if the recording medium in the recording / reproducing means is portable, the encryption key of the AV content data is used. There is an effect that there is no danger of flowing out.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of an information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic block diagram of an encryption key holding circuit provided in the information recording / reproducing apparatus shown in FIG.
FIG. 3 is a schematic block diagram of a descrambler provided in the information recording / reproducing apparatus shown in FIG.
FIG. 4 is a diagram illustrating a recording state of encryption key data and a time stamp in the encryption key holding circuit illustrated in FIG. 2;
FIG. 5 is a diagram illustrating recording data.
FIG. 6 is a schematic block diagram of an information recording / reproducing apparatus according to another embodiment of the present invention.
FIG. 7 is a schematic block diagram of a scrambler provided in the information recording / reproducing apparatus shown in FIG.
8 is a schematic block diagram in the case where the functions of the information recording / reproducing apparatus shown in FIG. 6 are realized by software.
FIG. 9 is a schematic block diagram of an information recording / reproducing apparatus for explaining the background of the invention.
[Explanation of symbols]
1 recording / reproducing device (recording / reproducing means, second recording medium)
2 DVD player (information reproducing means)
3 Timer device (timer means)
4. Encryption key holding circuit (encryption key holding means)
5 User I / F
6A System control circuit (control means, expiration date determination means, expiration date setting means)
6B System control circuit (control means, expiration date determination means, expiration date setting means)
7 Descrambler
8 Video data expansion circuit
9A DVD disk (first recording medium)
9B DVD disc (first recording medium)
10 Monitor
11 Scrambler
21 Semiconductor Memory
22 Command processing circuit
23 Battery
31 Random number generation shift register
32 parallel-serial converter
33 Ex-OR operator
34 serial-parallel converter

Claims (7)

In an information recording method for recording information recorded on a first recording medium on a second recording medium,
When recording the information recorded in the first recording medium in the encrypted state on the second recording medium, the information is recorded in the encrypted state and the validity for setting the expiration date of the decryption is set. An information recording method characterized by recording expiration information together. Information reproducing means for reproducing information recorded in an encrypted state on the first recording medium;
The information recorded on the first recording medium reproduced by the information reproducing means is recorded on the second recording medium in an encrypted state, and the information recorded on the second recording medium is used as necessary. Recording and reproducing means for reproducing;
Expiration date setting means for setting an expiration date for decryption of information recorded on the second recording medium;
When the information recorded on the second recording medium is reproduced by the recording / reproducing means, an expiration date determining means for determining whether or not the expiration date set by the expiration date setting means has been exceeded;
Control means for controlling the recording / reproducing means so as not to reproduce the information recorded on the second recording medium when the expiration date is judged to have passed by the expiration date determining means. An information recording / reproducing apparatus characterized by the above-mentioned. 3. The information recording / reproducing apparatus according to claim 2, wherein said expiration date setting means sets an expiration date based on an elapsed time from a point in time when information of the first recording medium is recorded on the second recording medium. 3. The information recording / reproducing apparatus according to claim 2, wherein said expiration date setting means sets an expiration date based on an elapsed time from a first decryption time of information recorded on the second recording medium. Information reproducing means for reproducing information encrypted by the first encryption key and information on a first recording medium on which the first encryption key is recorded;
Recording / reproducing means for recording the encrypted information recorded on the first recording medium on the second recording medium;
Expiration date recording means for recording, as date and time information, an expiration date for decryption of information recorded on the second recording medium;
Date and time information obtaining means for obtaining information on the current date and time,
When a request for reproducing information occurs, an expiration date determining unit that compares the date and time information recorded in the expiration date recording unit with the date and time information acquired from the date and time information acquisition unit to determine the expiration date,
When the expiration date determining means determines that the expiration date for decryption of the information recorded on the second recording medium has expired, the encrypted information recorded on the second recording medium is returned. Control means for controlling the recording and reproducing means so as not to reproduce information. Information reproducing means for reproducing information encrypted by the first encryption key and information on a first recording medium on which the first encryption key is recorded;
Recording / reproducing means for recording the encrypted information recorded on the first recording medium on the second recording medium in combination with the information for specifying the holding place of the encryption key holding means,
The first encryption key read from the first recording medium is held at a specific location, and the information recorded on the first recording medium is paired with the date and time information recorded on the second recording medium. Encryption key holding means for holding
Date and time information obtaining means for obtaining information on the current date and time,
When the information recorded on the second recording medium is reproduced by the recording / reproducing means, the date / time information recorded in the encryption key holding means is compared with the date / time information acquired from the date / time information acquiring means, Expiration date determining means for determining an expiration date of decryption of information recorded on the second recording medium;
When the date and time information determined by the expiration date determination unit is within the expiration date, the storage location of the encrypted information and the first encryption key for decrypting the information is specified from the first recording medium. Reading the information, reading the encryption key from the encryption key holding means based on the information for specifying the storage location of the first encryption key, and encrypting the encrypted information recorded on the second recording medium with the first encryption key. Control means for controlling said recording / reproducing means so as to decrypt with a key. 7. The information reproducing apparatus according to claim 6, wherein the encryption key holding unit encrypts the first encryption key with a second encryption key and records the first encryption key on the second recording medium.

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