JP2008165913A - Information recording and reproducing system and information recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing system capable of more flexibly dealing with the restriction of duplication frequency of contents and the management of duplication generation than CPRM. <P>SOLUTION: Duplication control information (CC1) is given by (1) duplication permission, (2) duplication prohibition, and (3) duplication permission (M≥1) for only the M generation. In the recording procedure of the contents to an optical disk, CCI performs the recording without encryption in (1); CC1 performs the recording prohibition in (2); the encryption recording pursuant to CPRP is performed in (3) and a content identification number and the CC1 are recorded after the test data of a power calibration area (PCA). In the reproduction (prohibition) procedure, the prohibition is processed as the conventional disk for dealing with the CRPM unless there is the CC1 in the PCA and if there is the CC1, the output prohibition setting is performed in when M=1 in (2) and (3) and the output permission setting is performed when M≥2 in (1) and (3). Also, the CC1 subtracting the content identification number and M by 1 is kept recorded in the PCA. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an information recording / reproducing system and information recording / reproducing method for recording / reproducing content data with a limited number of times of copying.

Conventionally, audio information recording and reproducing devices such as MD and DAT have SCMS (Serial Copy Management System) as a digital copy prevention standard, but there is also CGMS (Copy Generation Management System) for video content. CGMS-A for analog interface and CGMS-D for digital interface are standardized.

In the CGMS, ID information indicating whether copying is possible or not is included in a video signal, “Copy Free” (duplication permission) is “00”, and “Copy One Generation” (duplication permission for only one generation) is “10”. , “Copy Never” is recorded as ID information “11”, and the information recording / reproducing apparatus that receives the video content reproduces the information based on the information (recording of the broadcast program on the medium is also a form of duplication). ) Is determined.

Therefore, if it is “Copy Free”, it can be copied to media such as DVD (Digital Versatile Disk) without limitation, but if it is “Copy One Generation”, the received video content can be recorded and reproduced. It can only be recorded on the device, and “Copy Never” can directly reproduce the received video content but cannot record it on the information recording / reproducing device. As for the recording method of ID information, in CGMS-A, it is recorded in 21H (284H) of the vertical blanking period (VBI) of the analog signal, and in CGMS-D, a unique recording method is adopted according to the device and interface. Often done.

On the other hand, there is CPRM (Content Protection for Recordable Media) as a copyright protection technology for digital contents used for recordable DVDs, memory cards, etc., and a key bundle called MKB (Media Key Block) is recorded on the media side. In addition, advanced duplication control is realized using this and a device key (device key) prepared on the device side.

In CPRM, the MKB is recorded in the lead-in area of the medium, and unique ID information (media ID) that is different for each medium is recorded in an area called a BCA (Burst Cutting Area). Of course, both cannot be duplicated and cannot be tampered with. For the encryption of video content, an encrypted title key is generated from the media key and media ID generated by the device key, MKB, and copy control information (CCI: Copy Control Information) is added to the encrypted title key. This is done using an “encryption key” generated from the data. However, the CCI is given as CGMS ID information, and is sent from the content side at the time of recording and is encrypted and recorded together with the video content. However, the unencrypted CCI is also distributed together. The decryption is the reverse, and the media key is obtained from the MKB read from the media and the device key of the device, the decryption key is generated from the media ID, the media ID read from the media, and the CCI, and the media Decrypt the encrypted content above.

Therefore, when recording content on DVD media, it is necessary to use a combination of a DVD recorder compatible with CPRM and DVD media, and even when content recorded on DVD media is played back on other playback devices, The device needs to support CPRM. That is, in CPRM, even if the content is copied to other media, the media ID is not copied, so that it cannot be played back on the copy destination media.

The “Copy Never” permits only the direct reproduction of the received video content. However, since the viewer is limited to the viewing time zone, the following proposal is made in Patent Document 1 below. Yes. In other words, the actual intention of the copyright owner is to allow viewing only once. The received video content is temporarily stored in the storage means, and the reproduction means uses the “license prohibition” license. A recording / reproducing apparatus has been proposed in which information is regarded as being capable of reproducing the video content of the storage means only once. Further, in Patent Document 1, when the usage permission information is “Copy Never” or “Copy One Generation”, the video content can be moved by playing it only twice, and the user can freely select the media to be stored. A recording / reproducing apparatus is also proposed.
JP 2000-149417 A

As described above, copyright protection for video content is protected by CGMS and CPRM, and Patent Document 1 proposes recording and playback on media in consideration of practical convenience. However, the content of the proposal in Patent Document 1 only proposes a configuration of a recording / reproducing apparatus in which restrictions imposed by CGMS are relaxed in a limited manner based on an expanded guess of the author's intention.

On the other hand, considering the actual relationship between authors and viewers regarding individual video content, there are also various license conditions such as copying permission limited to private use purposes. This can be assumed and is not satisfied with the content proposed in Patent Document 1, and there is a possibility that more flexible replication management is required. Further, in realizing the copy management, compatibility with existing media and recording / reproducing apparatuses should be maintained as much as possible.

Therefore, in view of the above problems, the present invention is an information recording / reproducing that can more flexibly cope with the limitation of the number of times of replication and the management of the generation of replication while being as compatible as possible with conventional DVD media and recording / reproducing devices. It is an object to provide a system and an information recording / reproducing method.

According to a first aspect of the present invention, when content data distributed by incorporating duplication control information is input to an information recording / reproducing device, the information recording / reproducing device stores the content data if the duplication control information is other than duplication prohibition. In an information recording / reproducing system for recording on an optical disc and for setting the output permission or prohibition of output of content data to an information recording device as an external device based on the duplication control information, the duplication control information is recorded on the optical disc. The information recording / reproducing apparatus records the distributed content data in the data recording area of the optical disc when the information recording / reproducing apparatus records the distributed content data. A test recorded in the power calibration area (hereinafter referred to as “PCA”) of the optical disc in advance First control information recording means for recording the content identification information and the duplication control information after the data, and outputting the content data to the information recording apparatus as the external device by designating the content recorded on the optical disc When the request is made, if the copy control information corresponding to the content identification information corresponding to the specified content in the PCA at the latest writing position indicates the number of times of copying When the output prohibition setting is made and the copy permission or the number of times of duplication is indicated, reproduction output control means for setting the output permission and the content recorded on the optical disc are designated by the external device. When output of content data to a certain information recording device is made, the corresponding copy control information in the PCA is copied twice or more. The reproduction output control means performs output permission setting, and outputs the content data related to the specified content from the data recording area of the optical disc to the information recording apparatus that is the external device. Second control information recording means for recording content identification information corresponding to the content and copy control information indicating the copy count obtained by subtracting 1 from the copy count of the corresponding copy control information after the latest record information of the PCA; The present invention relates to an information recording / reproducing system.

According to the present invention, it is possible to set the number of times of duplication twice or more in the duplication control information of the content data supplied first, and by reducing the number of times by one each time duplication is performed. In addition, it is possible to realize management in which the conventional CPRM method is expanded with respect to content data replication. In addition, correction control information is recorded on a PCA that is always accessed when data is recorded in an information recording / reproducing apparatus for an optical disk, and duplication control is performed unless the number of duplication times is two or more. Since the information is common to the CPRM system, it is easy to have compatibility with the CPRM system.

In the first invention, when the reproduction output control means has recorded information consisting only of test data after the latest written content identification information and copy control information corresponding to the designated content in the PCA If the output prohibition setting is always performed, a falsification preventing function using the recording state of the PCA can be realized. In the first invention, when the distributed content data is recorded in the data recording area of the optical disc, a first calculation means for obtaining a hash value from the content data using a predetermined hash function, and recording on the optical disc A second value for obtaining a hash value from the content data of the designated content using the predetermined hash function when a content data output request is made to the information recording apparatus as the external device by designating the content that has been designated Computing means, and the first control information recording means makes the hash value obtained by the first computing means continuous to the test data recorded on the PCA of the optical disc so that the content identification information and the duplication control information And the reproduction output control means determines the first calculation means and the second calculation means. And when each hash values do not match always be to perform output prohibition setting, can confirm the presence or absence of falsification of the individual pieces of content data, it can be added more reliable and effective tamper prevention.

The second invention captures the first invention as a method, and when the content data distributed by incorporating the copy control information is input to the information recording / reproducing apparatus, the information recording / reproducing apparatus If the copy control information is other than copy prohibition, the content data is recorded on the optical disc, and the information recording / reproducing device permits or prohibits output of content data to the information recording device which is an external device based on the copy control information. In the information recording / reproducing method, the duplication control information is made up of information indicating duplication prohibition, duplication permission, or one or more duplication times, and the information recording / reproducing apparatus sends the distributed content data to the data on the optical disc. When recording in the recording area, the test data recorded on the PCA of the optical disc prior to the recording of the content data is connected. A first control information recording procedure for recording the content identification information and the duplication control information, and a content data output request to the information recording apparatus as the external device by designating the content recorded on the optical disc. When the copy control information corresponding to the content at the latest writing position in the content identification information corresponding to the designated content in the PCA indicates the number of times of copying, the output is prohibited. Information indicating that the external device is set by specifying a content to be recorded on the optical disc, and a reproduction output control procedure for setting the output permission when the setting is permitted and indicating the number of times of duplication or the number of times of duplication. When the content data output request to the recording device is made, the copy control information corresponding to the PCA is duplicated twice or more. When the output permission setting is performed in the reproduction output control procedure and content data related to the designated content is output from the data recording area of the optical disc to the information recording apparatus which is the external device, the designated content is displayed. Execute the second control information recording procedure for recording the corresponding content identification information and the copy control information indicating the copy number obtained by subtracting 1 from the copy number of the corresponding copy control information after the latest record information of the PCA. The present invention relates to an information recording / reproducing method.

Also in the second aspect of the present invention, each of the following configurations can have a falsification preventing function. (1) When there is recording information consisting only of test data after the latest written content identification information and copy control information corresponding to the designated content in the PCA in the playback output control procedure, always Make output prohibition setting. (2) When recording the distributed content data in the data recording area of the optical disc, a first calculation procedure for obtaining a hash value from the content data using a predetermined hash function, and the content recorded on the optical disc A second calculation procedure for obtaining a hash value from the content data of the designated content by using the predetermined hash function when a content data output request is made to the information recording apparatus as the external device. In the first control information recording procedure, the hash value obtained in the first calculation procedure is recorded continuously with the test data recorded on the PCA of the optical disc together with the content identification information and the duplication control information, In the reproduction output control procedure, the hash values obtained in the first calculation procedure and the second calculation procedure are combined. If not, always set output prohibition.

The information recording / reproducing system and information recording / reproducing method of the present invention have the following effects. In the conventional CPRM method, the generation management for copying content data is limited to only one generation. However, it is possible to set a copy permission condition for two or more generations as copy control information, and an information recording / reproducing system based on the conventional CPRM method. The number of times of copying can be freely set and managed in accordance with the contents in relation to the copyright owner side and the viewer side. In addition, there is also an advantage that a function for preventing falsification of content data can be provided by using the fact that the copy control information is additionally recorded after the test data in the power calibration area of the optical disc. Further, by obtaining the hash value from the content data and recording it in the power calibration area, it is possible to realize a falsification prevention function that is more reliable and more effective than when the copy control information is used.

Embodiments of the information recording / reproducing system and information recording / reproducing method of the present invention will be described below in detail with reference to the drawings.
[Embodiment 1]
First, FIG. 1 is a block diagram of an information recording / reproducing apparatus according to an embodiment of the present invention. 1 is an optical disk, 2 is a spindle motor for rotating the optical disk 1, and 3 is reading information from the optical disk 1 and for the optical disk 1. An optical pickup for writing information, 4 an amplifier for amplifying the read signal of the optical pickup 3, 5 a demodulator for demodulating the amplified read signal, 6 a laser drive circuit for driving a laser diode of the optical pickup 3, 7 Is a modulator that modulates recording data, 8 is a power control unit that controls the laser driving unit 6 based on a modulation signal of recording data by the modulator 7 or a control signal from the system control unit, and 9 is obtained from the demodulator 5. Spin based on address information and focus error signal or tracking error signal obtained from optical pickup 3 Servo circuit that performs rotation control of the motor and focus / tracking / slide control of the optical pickup 3, 10 is an encryption processing unit that encrypts recording data as required, 11 is an operation unit, and 12 is loading / ejecting of the optical disk 1. 13 is a system control unit that executes data transfer, communication with external devices and control of the entire system, 14 is a liquid crystal display unit, and 15 is a connection with an external device (content data supply device or recording device). Indicates the interface.

This information recording / reproducing apparatus has a CPRM-compatible function. When the optical disc 1 is a DVD-R / DVD-RW / DVD-RAM compatible with CPRM, CPRM is used when recording / reproducing (duplicating) content data. Copyright protection that conforms to Accordingly, the optical disk 1 is always checked at the time of recording / reproduction (duplication). The confirmation procedure is shown in the flowchart of FIG. First, when the optical disc 1 is set on a tray (not shown), a sensor (not shown) provided in the loading unit 12 detects it, and the system control unit 13 detects the disc in the built-in memory based on the detection signal. The type flag and CPRM flag are initialized (S1, S2). Next, when the loading unit 12 transports the optical disk 1 onto the turntable and the loading is completed, the optical disk 1 is rotated by the spindle motor 2 and the optical pickup 3 is moved to the innermost peripheral area to store the disk specific data. Read (S3, S4). The read signal of the disc specific data by the optical pickup 3 is input to the system control unit 13 via the amplifier 4 and the demodulator 5, and the system control unit 13 specifies the type of the optical disc 1 by a predetermined algorithm (S5).

Here, when the optical disk 1 is one of DVD-R / DVD-RW / DVD-RAM, the system control unit 13 selectively turns on the disk type flag corresponding to the corresponding disk, and thereafter In this operation, a recording / reproducing mode corresponding to the disc type is set (S6, S7). Further, the system control unit 13 confirms whether or not the optical disk 1 is compatible with CPRM. If the optical disk 1 is compatible with CPRM, the system controller 13 turns on the CPRM flag and reads the MKB and the media ID from the optical disk 1. Save to internal memory (S8 to S10). Since the information recording / reproducing apparatus of this embodiment is intended only for DVD-R / DVD-RW / DVD-RAM, if it is confirmed in step S6 that the disc is other than those, A notification to that effect is displayed on the liquid crystal display unit 14 and an ejection process is performed by the loading unit 12 (process A). If the optical disk 1 is not compatible with CPRM (for example, a data recording dedicated disk) in step S8, a message to that effect is displayed on the liquid crystal display unit 14 and thereafter handled as such a disk (processing) B).

By the way, the configuration and function described above and the disc confirmation operation are substantially the same in the conventional information recording / reproducing apparatus compatible with CPRM. The information recording / reproducing apparatus according to this embodiment performs conventional copy control based on CPRM and, for example, only “Copy Free”, “Copy One Generation”, and “Copy Never” in CPRM in terrestrial digital broadcasting or the like. Rather, it is also characterized in that it has a function that can cope with the case where content that allows copying of two or more generations is distributed with CCI set to “Copy M Generation” (where M ≧ 1) . However, it is assumed that “Copy One Generation” in CPRM and “Copy M Generation” in the case of M = 1 in the extended CCI are indicated by the same ID information.

Next, the content data recording procedure in the information recording / reproducing apparatus will be described with reference to the flowchart of FIG. First, in that case, it is assumed that a terrestrial digital broadcast tuner is connected to the connection interface 15 as an external device, and content data of a broadcast program can be input. Now, when a recording start instruction is given from the operation unit 11, the system control unit 13 executes the above-described disc confirmation procedure (FIG. 2), and whether or not the optical disc 1 is a DVD-R / DVD-RW / DVD-RAM. And whether or not the optical disk 1 is a CPRM compatible disk (S21, S22). If the optical disc 1 satisfies these conditions, the CCI is detected from the content data input via the connection interface 15 and saved in the built-in memory (S23, S25). If the optical disc 1 does not meet these conditions, the above processing A and processing B are performed (S23 → S24).

Next, the system control unit 13 determines whether or not the CCI of the built-in memory is “Copy Never”. If it is “Copy Never”, the content is copy-prohibited content on the liquid crystal display unit 14. Is displayed and recording on the optical disc 1 is not permitted. However, if “Copy Free” or “Copy M Generation” (where M ≧ 1), content data may be recorded on the optical disc 1. Since it is possible, the recording operation based on the respective duplication conditions is shifted to (S26, S27, S28).

First, in the case of “Copy Free”, after executing power calibration, the inputted content data is recorded as it is on the optical disc 1 without being encrypted (S28 → S29, S30). On the other hand, in the case of “Copy M Generation” (where M ≧ 1), an encryption key is created according to a procedure conforming to CPRM, and after power calibration is executed, the content data is stored in the encryption processing unit 10. It is encrypted and recorded on the optical disc 1 (S28 → S32, S33, S34).

As a characteristic procedure of this embodiment, in any case, the system control unit 13 performs the test recorded in the power calibration area (PCA) when the power calibration is performed when the recording of the content data is completed. After the data, the content identification number and the CCI saved in the internal memory are additionally recorded (S31 → S36, S35 → S36).

Next, content data reproduction (duplication) procedures by the information recording / reproducing apparatus according to this embodiment will be described with reference to the flowchart of FIG. In this case, since this information recording / reproducing apparatus also supports original CPRM, output is permitted when CCI is “Copy Free”, but output is prohibited when “Copy Never” and “Copy One Generation”. Thus, the same processing as in the conventional apparatus is performed. However, this information recording / reproducing apparatus also supports the case where CCI is “Copy M Generation” and M ≧ 2, and in this case, output permission is set.

First, when an external device is connected to the connection interface 15, the system control unit 13 determines whether or not digital connection has been made with the external device. Digital authentication conforming to (Digital Transmission Content Protection) is performed, and a procedure for mutual authentication is executed between the devices (S41 to S43). When mutual authentication is performed, it is confirmed whether or not the external device is a recording device. If the recording device is a recording device, a disk check procedure (FIG. 2) is further executed. If it is either DVD-RW / DVD-RAM and is compatible with CPRM, the identification number and title of the content recorded from the optical disc 1 are read out and displayed on the liquid crystal display unit 14 ( S44-S47). In the case of analog connection, it indicates that connection is not possible, if mutual authentication is not possible, it indicates that authentication is not possible, and if the connected device is a non-recording device, it indicates that output is not possible. It is displayed on the liquid crystal display unit 14 (S41 → S48, S43 → S49, S44 → S50). If the optical disc 1 does not meet the above condition in the disc confirmation procedure (FIG. 2), the above processing A and processing B are performed (S46 → S51).

Here, when a content output request specifying a content identification number is made by the operation unit 11, the system control unit 13 moves the optical pickup 3 to the PCA of the optical disc 1 via the servo circuit 9 and is recorded on the PCA. The data is read (S52, S53). Then, the system control unit 13 determines whether or not the CCI is included in the data read from the PCA, and only the test data is recorded after the content identification number related to the output designation and the latest writing position of the CCI. (S54, S55).

Of these two procedures (S54, S55), the former step S54 is for determining whether the optical disc 1 is compatible with CPRM and is also compatible with the information recording / reproducing apparatus of this embodiment. The latter step S55 confirms the possibility that the content data related to the output designation has been changed. That is, the presence of the CCI in the PCA means that the content data has been recorded by the information recording / reproducing apparatus of this embodiment. The fact that only the test data is recorded after the position in the PCA means that the output is output. This means that after the content according to the specification is recorded by the information recording / reproducing system of this embodiment, some recording is performed by another recording device (including a CPRM compatible recording device).

Therefore, if CCI does not exist in step S54, it is handled as a conventional CPRM optical disc 1 (N in S54), and only test data is recorded after the PCA position in step S55. In such a case, there is a possibility that some alteration has been made to the content data related to the output designation. Therefore, the system control unit 13 performs output prohibition setting in response to the content output request (S55 → S63).

On the other hand, if it is confirmed in step S55 that no change has been made to the content data, the system control unit 13 sets the latest writing position within the identification number corresponding to the designated content in the data read from the PCA. Check the CCI corresponding to a certain item. If “Copy Free”, immediately set output permission (S56 → S59). If “Copy One Generation”, set output prohibition (“Copy One Generation” In the case of “Copy M Generation” (M ≧ 2), the content identification number related to the output request and the new CCI: “Copy (M− 1) “Generation” (M ≧ 2) is additionally recorded in the PCA, and then output permission is set (S58, S59). The additional recording of the CCI with the content identification number and M decremented by 1 in this step S58 serves as judgment information when output permission / output prohibition is performed in step S57 for the next content designation output request, This is effective in determining the possibility of content data change in step S55.

If the CCI is not included in the PCA read data in the step S54 and the disc is a conventional CPRM compatible disc, a part of the content data designated for output is read to detect the CCI (S54 → S61). . The system control unit 13 immediately sets the output permission when the CCI is “Copy Free” (S62 → S59), but sets the output prohibition when the CCI is “Copy One Generation” (S62, S63). When the output permission setting is made, the system control unit 13 immediately reads the content data related to the output designation of the optical disc 1 by the optical pickup 3 and external equipment (recording equipment such as a DVD recorder) via the connection interface 15. The content data input by the external device is copied and recorded on the recording medium (S59, S60).

As described above, when the CCI is “Copy M Generation” (M ≧ 2), output permission is set for the content data related to the identification number associated with the CCI (S57 to S59). ) Since M is decremented by 1 every time it is played (duplicated) (S58), output prohibition is set even when a designated output request for the content is made when M becomes 1 (S58). S57 → S63).

[Embodiment 2]
In the information recording / reproducing apparatus according to the first embodiment, the identification number and CCI of the contents sequentially recorded on the PCA of the optical disc 1 are used, and the power calibration test data is later in time than the identification number and the CCI. If it is recorded, the content copy management function and the falsification prevention function are combined by setting output prohibition. However, according to the falsification prevention function, all the contents corresponding to the identification number recorded before the test data are subjected to the output prohibition setting, and can be copied without being falsified. There is a problem that copying is impossible despite the conditions.

In the information recording / reproducing system of the second embodiment, the information recording / reproducing apparatus obtains the hash value of the content data by the hash function method and records it on the PCA of the optical disc 1, which is a problem as in the first embodiment. A function to prevent tampering that does not occur is realized. The recording procedure of content data in the case of the hash function method is shown in the flowchart of FIG. As is apparent from a comparison between FIG. 3 and FIG. 3, the process is the same from the recording start instruction to the execution of power calibration (S21 to S33). A feature of the recording procedure in this embodiment is that, when content data is recorded on the optical disc 1, a hash value is calculated from the content data using a predetermined hash function regardless of whether or not the content data is encrypted. In addition, after the PCA test data is recorded, the hash value finally obtained together with the content identification number and the CCI is recorded after completion of the recording of the content data (S30 ′, S31 → S36 ′, S34 ′, S35 → S36). ').

On the other hand, the reproduction (duplication) procedure of content data in this embodiment is shown in the flowchart of FIG. Also in this case, as is apparent from a comparison between FIG. 4 and FIG. 4, the procedure for confirming whether or not the content data has been changed according to the output designation in the first embodiment (S55 in FIG. 4) is the latest in the content identification number and CCI. While it was confirmed whether or not only test data was recorded after the writing position (S55 in FIG. 4), in this embodiment, the same procedure as in the recording procedure is performed from the content data related to output designation. A procedure for calculating a hash value using a hash function and determining whether or not the hash value of the calculation result matches the hash value associated with the identification number of the content related to output designation in PCA (S55- 1, S55-2) is different only in that it is executed.

If the hash values do not match, output prohibition is set so that the content data related to the output specification can be regarded as falsified (S55-2 → S63), and output permission is set according to the CCI conditions only when they match. Alternatively, output prohibition setting is performed (S55-2 → S56 to S60, S63). That is, in this embodiment, a hash value is additionally recorded in the PCA so that the presence / absence of falsification related to individual content data can be confirmed by a hash function method. Therefore, as in the case of the first embodiment, there is no inconvenience that the content data that can be copied under the CCI conditions cannot be copied due to the possibility of falsification of other content data even though the content data has not been falsified. A more appropriate falsification prevention function can be used together.

The present invention can be applied to an information recording / reproducing apparatus having a function of controlling and managing the number of times of copying content data.

1 is a block diagram of an information recording / reproducing apparatus according to an embodiment of the present invention. It is a flowchart which shows the disc confirmation procedure by an information recording / reproducing apparatus. 3 is a flowchart showing a recording procedure of content data by the information recording / reproducing apparatus according to the first embodiment. 3 is a flowchart showing a procedure of reproducing (duplicating) content data by the information recording / reproducing apparatus according to the first embodiment. 10 is a flowchart showing a recording procedure of content data by the information recording / reproducing apparatus according to the second embodiment. 12 is a flowchart showing a procedure for reproducing (duplicating) content data by the information recording / reproducing apparatus according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Optical pick-up, 4 ... Amplifier, 5 ... Demodulator, 6 ... Laser drive part, 7 ... Modulator, 8 ... Power control part, 9 ... Servo circuit, 10 ... Encryption process 11, operation unit 12, loading unit 13, system control unit 14, liquid crystal display unit 15, connection interface

Claims (6)

When content data distributed by incorporating duplication control information is input to an information recording / reproducing apparatus, the information recording / reproducing apparatus records the content data on an optical disc if the duplication control information is other than duplication prohibition, and In the information recording / reproducing system in which the information recording / reproducing device sets permission or prohibition of output of content data to the information recording device which is an external device based on the duplication control information,
The copy control information consists of information indicating copy prohibition, copy permission, or one or more copy times,
The information recording / reproducing apparatus comprises:
When the distributed content data is recorded in the data recording area of the optical disc, the content identification is performed after the test data recorded in the power calibration area (hereinafter referred to as “PCA”) of the optical disc prior to the recording of the content data. First control information recording means for recording information and the replication control information;
When the content recorded on the optical disc is designated and a content data output request is made to the information recording apparatus which is the external device, the latest content identification information corresponding to the designated content in the PCA. If the copy control information corresponding to the one at the write position indicates one copy number, output prohibition is set, and if it indicates copy permission or two or more copy numbers, output is performed. Playback output control means for setting permission,
When the content recorded on the optical disc is designated and a content data output request is made to the information recording apparatus, which is the external device, the corresponding duplication control information in the PCA indicates the number of times of duplication twice or more. Corresponding to the designated content when the reproduction output control means performs output permission setting and outputs the content data related to the designated content from the data recording area of the optical disc to the information recording apparatus which is the external device. Second control information recording means for recording content identification information to be copied and copy control information indicating the copy count obtained by subtracting 1 from the copy count of the corresponding copy control information after the latest record information of the PCA. An information recording / reproducing system characterized by comprising:   The playback output control means always prohibits output when there is recording information consisting only of test data after the latest written content identification information and copy control information corresponding to the specified content in the PCA. The information recording / reproducing system according to claim 1, wherein the setting is performed. When recording the distributed content data in the data recording area of the optical disc, the first calculation means for obtaining a hash value from the content data using a predetermined hash function and the content recorded on the optical disc are designated. Second output means for obtaining a hash value from the content data of the designated content using the predetermined hash function when an output request of the content data to the information recording apparatus as the external device is made;
The first control information recording means records the hash value obtained by the first computing means together with the content identification information and the duplication control information in succession to the test data recorded on the PCA of the optical disc, and reproduces it. 2. The information recording / reproducing system according to claim 1, wherein the output control means always performs output prohibition setting when the hash values obtained by the first calculation means and the second calculation means do not match. . When content data distributed by incorporating duplication control information is input to an information recording / reproducing apparatus, the information recording / reproducing apparatus records the content data on an optical disc if the duplication control information is other than duplication prohibition, and In the information recording / reproducing method in which the information recording / reproducing apparatus sets permission or prohibition of output of content data to the information recording apparatus which is an external device based on the replication control information.
The copy control information consists of information indicating copy prohibition, copy permission, or one or more copy times,
The information recording / reproducing apparatus comprises:
When the distributed content data is recorded in the data recording area of the optical disc, the content identification information and the duplication control information are recorded in succession to the test data recorded on the PCA of the optical disc prior to the recording of the content data. A first control information recording procedure;
When the content recorded on the optical disc is designated and a content data output request is made to the information recording apparatus which is the external device, the latest content identification information corresponding to the designated content in the PCA. If the copy control information corresponding to the one at the write position indicates one copy number, output prohibition is set, and if it indicates copy permission or two or more copy numbers, output is performed. Playback output control procedure for setting permission,
When the content recorded on the optical disc is designated and a content data output request is made to the information recording apparatus, which is the external device, the corresponding duplication control information in the PCA indicates the number of times of duplication twice or more. Corresponding to the designated content when the output permission setting is performed in the reproduction output control procedure and the content data related to the designated content is output from the data recording area of the optical disc to the information recording apparatus which is the external device. A second control information recording procedure for recording the content identification information to be recorded and the copy control information indicating the copy count obtained by subtracting 1 from the copy count of the corresponding copy control information after the latest record information of the PCA. An information recording / reproducing method.   In the reproduction output control procedure, output prohibition setting is always set when there is recording information consisting only of test data after the latest written content identification information and copy control information corresponding to the designated content in the PCA. 5. The information recording / reproducing method according to claim 4, wherein: When recording the distributed content data in the data recording area of the optical disc, a first calculation procedure for obtaining a hash value from the content data using a predetermined hash function, and specifying the content recorded on the optical disc A second calculation procedure for obtaining a hash value from the content data of the designated content using the predetermined hash function when an output request of the content data to the information recording device as the external device is made;
In the first control information recording procedure, the hash value obtained in the first calculation procedure is recorded continuously with the test data recorded on the PCA of the optical disc together with the content identification information and the duplication control information, and the reproduction is performed. 5. The information recording / reproducing according to claim 4, wherein in the output control procedure, output prohibition setting is always performed when the hash values obtained in the first calculation procedure and the second calculation procedure do not match. Method.

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