JP2009181659A - Information processing device and content transferring method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing device for transferring content data to an optical disk without losing the value of a copy counter. <P>SOLUTION: In a TV application program 110, when content data d13 stored in an HDD13 is moved to an optical disk such as an HD DVD, a copy counter d11 of this content data d13 also is moved to the optical disk. Then, in the TV application program 110, when a title key d12 for decoding content data d13 moved to the optical disk is stored in the optical disk after encryption, the copy counter d11 is used as one of parameters of the encryption. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a content data management technique suitable for application to an information processing apparatus such as a personal computer or a video recorder having a function of recording, for example, copyright-protected television broadcast program data.

  In the current copy rule of terrestrial digital broadcasting and BS (Broadcasting Satellite) digital broadcasting, content data is broadcast as COG (Copy One Generation) and becomes NMC (No More Copy) when recorded by a receiving device. Therefore, it cannot be copied to another device or an optical disk, and only movement is allowed.

Various proposals have been made so far for appropriately managing content data in consideration of this copy rule (see, for example, Patent Document 1).
JP 2006-114089 A

  On the other hand, a new copy rule has recently been developed in a direction to relax this copy rule. That is, in the future, N (2 or more) copies are permitted. The possible remaining number of copies is held by a copy counter for each content data.

  Here, after the new copy rule is established, for example, a user of a video recorder having a built-in HDD (Hard Disk Drive) transfers content data to an HD DVD (High Definition Digital Versatile Disc) in order to secure free space in the HDD. Consider the case of moving to an optical disc.

  From the viewpoint of copyright protection, alteration of the copy counter (especially increasing its value) is not allowed. Therefore, in order to move the content data to the optical disc, a mechanism for securely storing the copy counter on the optical disc, that is, the alteration cannot be performed, or the content data cannot be used after the alteration. A mechanism to do this is necessary.

  However, since no such mechanism currently exists, even if one or more possible remaining times are held in the copy counter, the value must be deleted so that unauthorized copying cannot be performed thereafter. Further, there is no mechanism for returning the content data to the HDD, and it is impossible to restore the copy counter by moving the content data again from the optical disk to the HDD.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an information processing apparatus and a content moving method that can move content data to an optical disc without losing the value of a copy counter. And

  In order to achieve the above-described object, an information processing apparatus according to the present invention includes a storage device that stores content data with a limited number of times of copying, a copy counter that holds the remaining number of times that the content data can be copied, and a recording medium. A media driving device that detachably accommodates and controls writing of data to the recording medium and reading of data from the recording medium, and a content key stored in the storage device, a title key determined for each content data And moving the content data from the storage device to the recording medium by erasing the content data from the storage device and storing it in the recording medium accommodated in the media driving device And the content moving means Copy counter storage means for storing a copy counter of content data to be moved stored in the storage device in a predetermined area of the recording medium, and decrypting the encrypted content data stored in the recording medium Title key storage means for encrypting the title key using at least one parameter including a value of a copy counter stored on the recording medium by the copy counter storage means and storing the encrypted key on the recording medium. It is characterized by.

  The information processing apparatus of the present invention also includes a storage device that stores content data with a limited number of times of copying and a copy counter that holds the remaining number of times that the content data can be copied, and a recording medium that is detachable, A medium driving device that controls writing of data to a recording medium and reading of data from the recording medium, and content data stored in the storage device are encrypted using a title key determined for each content data, and Content moving means for moving content data from the storage device to the recording medium by storing the content data in the recording medium accommodated in the media driving device and erasing the content data from the storage device, The content moving means is the destination recording medium Copy counter management means for managing the identification information and a copy counter management table that holds a value obtained by subtracting 1 from the value of the copy counter to be moved as the remaining copyable count, and the content data moved to the recording medium in the recording device And a copy counter restoring means for restoring to the recording apparatus a copy counter that holds the duplicatable remaining number of times held in the copy counter table.

  The content transfer method of the present invention also includes a storage device that stores content data with a limited number of times of copying and a copy counter that holds the remaining number of times that the content data can be copied, and a recording medium that is detachable, A content transfer method for an information processing apparatus comprising: a medium driving device that controls writing of data to a recording medium and reading of data from the recording medium, wherein the information processing apparatus is stored in the storage device The content data is encrypted using a title key determined for each content data and stored in a recording medium accommodated in the media driving device, and the content data is deleted from the storage device, thereby being deleted from the storage device. Move content data to the recording medium A copy counter of content data to be moved stored in a storage device is stored in a predetermined area of the recording medium, and the title key for decrypting the encrypted content data stored in the recording medium is stored in the copy The counter storing means encrypts the data using at least one parameter including a copy counter value stored in the recording medium and stores the encrypted data in the recording medium.

  According to the present invention, it is possible to provide an information processing apparatus and a content moving method that can move content data to an optical disc without losing the value of the copy counter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a system configuration of an information processing apparatus according to an embodiment of the present invention. The information processing apparatus of the present embodiment is realized as a notebook type personal computer, for example.

  This computer has a television (TV) function for viewing and recording broadcast program data broadcast by a television broadcast signal. This TV function is realized by a TV application program 110, which will be described later, installed in advance in the computer.

  As shown in FIG. 1, the computer includes a CPU 1, a north bridge 2, a main memory 3, a south bridge 4, a graphics processing unit (GPU) 5, a video memory (VRAM) 5A, an LCD (Liquid Crystal Display) 6, an HDMI ( high-definition multimedia interface) control circuit 7, HDMI terminal 8, sound controller 9, speaker 10, BIOS-ROM 11, LAN controller 12, HDD 13, HD DVD drive 14, video processor 15, memory 15A, wireless LAN controller 16, IEEE 1394 A controller 17, an embedded controller / keyboard controller (EC / KBC) 18, a keyboard (KB) 19, a touch pad 20, a remote control unit interface 21, a TV tuner 22, an EEPROM 23, etc. There.

  The CPU 1 is a processor that controls the operation of the computer, and is loaded from the HDD 13 to the main memory 3, and various application programs such as an operating system (OS) 100 and a TV application program 110 that operates under the OS 100. Execute. As described above, the TV application program 110 is software for executing a TV function.

  The TV application program 110 performs live reproduction processing for viewing broadcast program data received by the TV tuner 22, recording processing for recording the received broadcast program data in the HDD 13, and broadcast program data / video data recorded in the HDD 13. A reproduction process to be reproduced is executed as a basic process of the AV function. The TV application program 110 also executes a process of copying or moving the broadcast program data / video data recorded in the HDD 13 to various optical disks accommodated in the HD HDD drive 14.

  Some broadcast program data (hereinafter also referred to as content data) received by the TV tuner 22 has a limited number of copies for copyright protection. The possible remaining number of copies is held by a copy counter for each content data. Therefore, when this type of content data is moved to the optical disc, the copy counter is appropriately managed (so that the copy counter can be restored when the content moved to the optical disc is returned to the HDD 13 again). There is a need to. Therefore, this computer is provided with a mechanism for the TV application program 110 to securely store the copy counter on the optical disk, which will be described later.

  The CPU 1 also executes a BIOS stored in a BIOS (Basic Input Output System) -ROM 11. The BIOS is a program for hardware control.

  The north bridge 2 is a bridge device that connects the local bus of the CPU 1 and the south bridge 4. The north bridge 2 also includes a memory controller that controls access to the main memory 3. The north bridge 2 also has a function of executing communication with the GPU 5 via a PCI EXPRESS standard serial bus or the like.

  The GPU 5 is a display controller that controls the LCD 6 used as a display monitor of the computer. A display signal generated by the GPU 5 is sent to the LCD 6. The GPU 5 can also send a digital video signal to an external display device via the HDMI control circuit 7 and the HDMI terminal 8.

  The HDMI terminal 8 can send an uncompressed digital video signal and a digital audio signal to an external display device with a single cable. The HDMI control circuit 7 is an interface for sending a digital video signal to an external display device called an HDMI monitor via the HDMI terminal 8.

  The south bridge 4 controls each device on an LPC (Low Pin Count) bus and each device on a PCI (Peripheral Component Interconnect) bus. Further, the south bridge 4 includes an IDE (Integrated Drive Electronics) controller for controlling the HDD 13 and the DVD drive 14. Furthermore, the south bridge 4 also has a function of executing communication with the sound controller 9. A video processor 15 is connected to the south bridge 4 via a PCI EXPRESS standard serial bus or the like. The video processor 15 is a processor that executes various processes related to video indexing for presenting an outline of video content data to the user. The memory 15A is used as a working memory for the video processor 15.

  The sound controller 9 is a sound source device and outputs audio data to be reproduced to the speaker 10 or the HDMI control circuit 7.

  The wireless LAN controller 16 is a wireless communication device that performs wireless communication of, for example, the IEEE 802.11 standard. On the other hand, the IEEE 1394 controller 17 executes communication with an external device via an IEEE 1394 standard serial bus.

  The EC / KBC 18 is a one-chip microcomputer in which an embedded controller for power management and a keyboard controller for controlling the keyboard 19 and the touch pad 20 are integrated. The EC / KBC 18 has a function of powering on / off the computer according to the operation of the power button by the user. The EC / KBC 18 has a function of executing communication with the remote control unit interface 21.

  The TV tuner 22 is a receiving device that receives broadcast program data broadcast by a television (TV) broadcast signal, and is connected to an antenna terminal. The TV tuner 22 is realized as a digital TV tuner capable of receiving digital broadcast program data such as terrestrial digital broadcast and BS digital broadcast.

  Here, with reference to FIG. 2, an outline of content data movement processing executed by the TV application program 110 will be described.

  The TV application program 110 stores the broadcast program data received by the TV tuner 22 in the HDD 13 as a content data set d1. The content data set d1 is composed of a copy counter d11, a title key d12, and content data (broadcast program data) d13, and is encrypted with the local encryption key d2. The local encryption key d2 is set based on a value arbitrarily input by the user via the user interface provided by the TV application program 110, and is held by the TV application program 110. The TV application program 110 also provides a user interface for setting the device key d3. As the device key d3, a value determined in accordance with a predetermined rule assigned to each (regular) TV application program 110 is input by the user, and is set and held by the TV application program 110.

  In order to move the content data set d1 stored in the HDD 13 to an optical disc such as an HD DVD in such a state, the TV application program 110 includes a content movement control module 111.

  The content movement control module 111 temporarily decrypts the content data set d1 to be moved stored in the HDD 13 with the local encryption key d2. The content movement control module 111 then encrypts the content data d13 using the title key d12, and stores the encrypted content data d13 ′ on the optical disc. Further, the content movement control module 111 stores a copy counter d11 of the content data on the optical disc (copy counter d11 ′).

  At this time, the content movement control module 111 uses the title key d12 for decrypting the content data d13 ′ as the Media Key Block (MKB) d4 and Binding Nonce (BN) d5 of the optical disc, the copy counter d11, and the device key d3. The encrypted title key d12 ′ is stored in the optical disc. The title key encryption unit 111a is a routine for executing encryption of the title key d12 using these values as parameters.

  Thus, since the TV application program 110 uses the copy counter as one of the parameters for encrypting the title key d12, if the copy counter d11 ′ on the optical disk is falsified, the content data d13 ′ The title key d12 ′ for decrypting is not correctly decrypted. That is, it is possible to securely store the copy counter on the optical disc. Therefore, the content movement control module 111 can restore the copy counter when the content is moved again from the optical disk to the HDD 13.

  FIG. 3 is a diagram showing an example of data arrangement in the optical disc.

  As shown in FIG. 3, the data storage area of the optical disc is divided into “Protected Area”, “Read Only Area”, and “Read / Write Area”. BNd5 stored in the “Protected Area” is a random number generated by the HD DVD drive 14. The content movement control module 111 requests the HD DVD drive 14 to update this BNd5, that is, to generate / store a new random number, when performing content movement processing from the HDD 13 to the optical disk or from the optical disk to the HDD 13. And the title key encryption part 111a uses this BNd5 for encryption of the title key d12 as mentioned above. Thereby, the TV application program 110 copes with the backup / restore attack of the optical disc in addition to securely storing the copy counter on the optical disc.

  An optical disk backup / restore attack is a process in which data on an optical disk is backed up to another storage medium before moving the content data on the optical disk to the HDD 13, and the backed up data is moved to the HDD 13. By restoring to the optical disc, the content data that should have been moved is illegally reused. Even if the backed-up data is restored to the optical disk, the BNd5 necessary for decoding the title key d12 ′ is updated when moving to the HDD 13, so the title key d12 ′ is not correctly decoded. Unauthorized use of content data is prevented.

  MKBd4 stored in “Read / Write Area” is a value updated by the content movement control module 111 when moving content data from the HDD 13 to the optical disk. A specific value (Km) can be obtained by executing a predetermined process called an MKB process using this value and the device key d3 assigned to each of the (regular) TV application programs 110 described above. It has become.

  Then, the title key encryption unit 111a uses this Km (obtained by using MKBd4) for encryption of the title key d12, thereby assigning a device key d3 that is a value determined in accordance with a predetermined rule. The content data on the optical disc is prevented from being used by unauthorized software or a playback device that does not receive the data (that is, cannot obtain Km).

  In addition, in HD DVD, an area for storing Usage Rules is provided in “Read / Write Area”. In this Usage Rules, (1) DOT (Digital Only Token) analog output restriction and (2) Priority bit (flag indicating whether CCI or Usage Rule in the stream should be given priority) are defined. Therefore, the content movement control module 111 expands this Usage Rules and stores the copy counter d11 ′. Further, in this “Read / Write Area”, the title key d12 ′ encrypted by the content movement control module 111 and the content data d13 ′ encrypted similarly are stored.

  The “Read Only Area” stores Media IDd6, which is a different value for each optical disc.

  Next, with reference to FIG. 4, the basic principle of the content data movement processing executed by the TV application program 110 will be described in detail.

  When moving the content data to the optical disc, the TV application program 110 first updates the MKBd4 of the optical disc ((1) in FIG. 4). Then, the TV application program 110 executes MKB processing using the updated MKBd4 and the device key d3 to generate Km ((2) in FIG. 4).

  At this time, the TV application program 110 also updates BNd5 of the optical disc, and AES-encrypts Km using the updated BNd5 ((3) in FIG. 4). Further, the TV application program 110 performs AES hashing on the copy counter d11 ((4) in FIG. 4), and obtains an exclusive OR (XOR) between the value and the title key d12 ((5) in FIG. 4). The copy counter d11 itself is stored as it is in the usage rules of the optical disc ((6) in FIG. 4).

  Then, the TV application program 110 AES-encrypts the AES-hashed copy counter d11 and the exclusive OR (XOR) title key d12 with Km obtained by AES encryption using the updated BNd5 ((6) in FIG. 4). ) And the result is stored in the optical disc. Also, the TV application program 110 encrypts the content data d13 with the title key d12 ((7) in FIG. 4), and stores the result on the optical disc.

  Thus, in this information processing apparatus, when the TV application program 110 uses the copy counter d11 for encryption of the title key d12 and the copy counter d11 ′ on the optical disc is falsified, the title key d12 ′ cannot be correctly decrypted. The content data d13 ′ cannot be used. That is, a mechanism for securely storing the copy counter d11 on the optical disc is realized.

  By the way, in the above, when content data is moved to a rewritable type HD DVD in which the usage rules are stored in the “Read / Write Area” (that is, to the HDD 13 accompanied by data erasure on the HD DVD). The method of managing the copy counter in the case where the content data can be re-moved) has been described, but there is a write-once type HD DVD (HD DVD-R) referred to as a write-once disk or an area for storing Usage Rules. In a conventional DVD that is not provided in the “Read / Write Area”, once data is written, it cannot be erased or the copy counter itself cannot be stored. 110 executes copy counter management processing as follows. 5 and 6 are diagrams for explaining the outline of the copy counter management process.

  In order to manage the copy counter when moving content data to this type of optical disc, the TV application program 110 is provided with a copy counter management table 112 as shown in FIG. A copy counter management unit 111b is further provided.

  When the content movement control module 111 moves content data to this type of optical disc, the copy counter management unit 111b uses the media ID d6 of the destination optical disc (shown in FIG. 3) and the copy counter of the content data to be moved. One set of d11 is stored in the copy counter management table 112. When this movement is completed, the value of the copy counter d11 stored in the copy counter management table 112 is decremented by one. That is, as shown in FIG. 6, the copy counter management table 112 manages the media ID of each optical disk and the value obtained by subtracting 1 from the copy counter of each content data. Instead of securely storing the copy counter of the content data to be moved to the destination optical disc, the copy counter of the content data moved to the optical disc is managed by binding to the source information processing apparatus. is there.

  The content transfer module 111 performs recording in accordance with content protection such as AACS in the case of HD DVD-R, and performs recording using CPRM in the case of a conventional type DVD.

  When content data is re-moved from the optical disc managed in the copy counter management table 112 to the HDD 13, the content movement control module 111 first has the media ID of the source optical disc in the copy counter management table 112. Find out if you want to. If it exists, the content movement control module 111 permits the remigration, and restores the copy counter d11 of the HDD 13 using the value of the copy counter management table 112. When the optical disc is of the write-once type, the content data remains on the optical disc even after movement, but 1 is subtracted when moving to the optical disc, so that consistency is maintained. In addition, since copying of content data from the optical disk to the HDD of an apparatus that does not have a media ID in the copy counter management table 112 (not the original transfer source) is not permitted, unauthorized copying is also prevented.

  If the optical disc is a rewritable type, the content movement control module 111 does not permit the re-migration because there is a risk of a backup / restore attack. Therefore, even if an attempt is made to increase the number of copies substantially by performing a movement accompanied by data erasure of the optical disk (assuming a backup / restore attack), the value of the copy counter decremented by 1 when moving to the optical disk is It is held as it is. When it is desired to return the content data to the HDD 13, the copy counter d11 of the copy counter management table 112 (subtracted by 1) is restored by copying.

  7 and 8 show that an area for storing a write-once type HD DVD (HD DVD-R) called a write-once disk or the like, which is executed by the TV application program 110, or Usage Rules is “Read / Write Area”. It is a flowchart which shows the flow of a process of the movement of the content data to optical disks, such as the conventional type DVD which is not provided, and the re-migration of the content data from this kind of optical disk.

  When the content data is moved to the optical disc, the TV application program 110 stores the media ID d6 of the destination optical disc and the copy counter d11 of the content data to be moved as a set in the copy counter management table 112 (FIG. 7). At the same time, the content data is moved to the optical disc (step A2 in FIG. 7).

  When the transfer of the content data to the optical disk is completed (YES in step A3 in FIG. 7), the TV application program 110 subtracts 1 from the value of the copy counter d11 stored in the copy counter management table 112 (FIG. 7). Step A4).

  On the other hand, when re-moving content data from an optical disc, the TV application program 110 first checks whether the media ID d6 of the optical disc exists in the copy counter management table 112 (step B1 in FIG. 8). If it exists (YES in step B1 in FIG. 8), the TV application program 110 subsequently checks whether the optical disc is a rewritable type (step B2 in FIG. 8).

  If it is not the rewritable type (NO in step B2 in FIG. 8), the TV application program 110 permits the re-migration and executes the re-migration of the content data from the optical disc (step B3 in FIG. 8). The copy counter d11 of the HDD 13 is restored using the value of the copy counter management table 112 (subtracted by 1) (step B4 in FIG. 8).

  As described above, according to the information processing apparatus, if the rewritable type HD DVD (the area for storing Usage Rules is provided in the “Read / Write Area”) is used, the comp counter can be secured together with the content data. When moving content data from these optical discs by moving them, and managing copy counters by binding them to the source information processing device, even for write-once HD DVDs and conventional DVDs It is possible to restore the copy counter. That is, the content data can be moved to the optical disk without losing the value of the copy counter.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine a component suitably in different embodiment.

The figure which shows the system configuration | structure of the information processing apparatus which concerns on one Embodiment of this invention. FIG. 6 is a diagram for explaining an overview of content data movement processing executed by the TV application program that runs on the information processing apparatus of the embodiment. A diagram showing an example of data arrangement in an optical disc 2 is a diagram for explaining in detail the basic principle of content data movement processing executed by the TV application program operating on the information processing apparatus of the embodiment; FIG. 1st figure for demonstrating the outline | summary of the movement process (modification) of the content data which the TV application program which operate | moves on the information processing apparatus of the embodiment performs 2nd figure for demonstrating the outline | summary of the movement process (modification) of the content data which the TV application program which operate | moves on the information processing apparatus of the embodiment performs 1st flowchart which shows the flow of a process of the movement of the content data (to HD DVD-R etc.) which the TV application program which operate | moves on the information processing apparatus of the embodiment performs A flowchart showing a flow of processing of re-moving content data (from an HD DVD-R or the like) executed by a TV application program operating on the information processing apparatus of the embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... CPU, 2 ... North bridge, 3 ... Main memory, 4 ... South bridge, 5 ... Graphics processing unit (GPU), 5A ... Video memory (VRAM), 6 ... LCD, 7 ... HDMI control circuit, 8 ... HDMI terminal , 9 ... Sound controller, 10 ... Speaker, 11 ... BIOS-ROM, 12 ... LAN controller, 13 ... HDD, 14 ... HD DVD drive, 15 ... Video processor, 15A ... Memory, 16 ... Wireless LAN controller, 17 ... IEEE1394 controller 18 ... Embedded controller / keyboard controller (EC / KBC), 19 ... Keyboard (KB), 20 ... Touchpad, 21 ... Remote control unit interface, 22 ... TV tuner, 23 ... EEPROM, 100 ... Operating system (OS), 110 ... TV application program, 111 ... content movement control module, 111a ... title key encryption unit, 111b ... copy counter management unit, 112 ... copy counter management table.

Claims (8)

A storage device for storing content data in which the number of times of copying is limited and a copy counter that holds the remaining number of times that the content data can be copied;
A medium driving device that detachably accommodates a recording medium and controls writing of data to the recording medium and reading of data from the recording medium;
The content data stored in the storage device is encrypted using a title key determined for each content data, stored in a recording medium accommodated in the media driving device, and the content data is deleted from the storage device. Content moving means for moving content data from the storage device to the recording medium;
Comprising
The content moving means includes
Copy counter storage means for storing a copy counter of content data to be moved stored in the storage device in a predetermined area of the recording medium;
The title key for decrypting the encrypted content data stored in the recording medium is encrypted using at least one parameter including a value of a copy counter stored in the recording medium by the copy counter storage means Title key storage means for storing in the recording medium,
An information processing apparatus comprising:   The content moving means further comprises copy counter restoring means for restoring the copy counter stored in the recording medium to the storage device when the content data moved to the recording medium is returned to the storage device. The information processing apparatus according to claim 1.   The title key storage means of the content moving means uses a random number held in the recording medium that is updated every time data is written as a parameter for encrypting the title key. Item 6. The information processing apparatus according to Item 1. The content moving means further includes copy counter management means for managing a copy counter management table that holds the identification information of the recording medium to be moved and a value obtained by subtracting 1 from the value of the copy counter to be moved as the remaining number of times that can be copied. And
The copy counter restoring means restores, to the recording device, a copy counter that holds the remaining duplicatable number held in the copy counter table when the recording medium is a write-once type. Information processing device.   The content moving means checks whether or not the identification information of the recording medium is held in the copy counter management table when returning the content data moved to the recording medium to the storage device. 5. The information processing apparatus according to claim 4, further comprising determination means for determining whether or not to permit data to be returned to the storage device.   The determination unit of the content moving unit permits movement of content data from the recording medium to the storage device when the recording medium is rewritable according to a standard in which the predetermined area is not defined. The information processing apparatus according to claim 5, wherein the information processing apparatus is not. A storage device for storing content data in which the number of times of copying is limited and a copy counter that holds the remaining number of times that the content data can be copied;
A medium driving device that detachably accommodates a recording medium and controls writing of data to the recording medium and reading of data from the recording medium;
The content data stored in the storage device is encrypted using a title key determined for each content data, stored in a recording medium accommodated in the media driving device, and the content data is deleted from the storage device. Content moving means for moving content data from the storage device to the recording medium;
Comprising
The content moving means includes
Copy counter management means for managing the copy counter management table that holds the identification information of the recording medium to be moved, and the value obtained by subtracting 1 from the value of the copy counter to be moved as the remaining number of times that can be copied;
A copy counter restoring means for restoring, to the recording device, a copy counter that retains the remaining copyable number held in the copy counter table when returning the content data moved to the recording medium to the recording device;
An information processing apparatus comprising: A storage device that stores content data with a limited number of times of copying and a copy counter that holds the remaining number of times that the content data can be copied; A content moving method of an information processing apparatus comprising a media driving device that controls reading of data from a medium,
The information processing apparatus includes:
The content data stored in the storage device is encrypted using a title key determined for each content data, stored in a recording medium accommodated in the media driving device, and the content data is deleted from the storage device. By moving content data from the storage device to the recording medium,
Storing a copy counter of content data to be moved stored in the storage device in a predetermined area of the recording medium;
The title key for decrypting the encrypted content data stored in the recording medium is encrypted using at least one parameter including a value of a copy counter stored in the recording medium by the copy counter storage means Stored in the recording medium,
A content moving method characterized by the above.

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