JP2006201903A - Content moving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content moving device capable of performing secure movement of a digital content accumulated in a storage medium. <P>SOLUTION: When a digital broadcast content received by a tuner is stored in an HDD 301, decoding of the digital broadcast content received by the tuner, insertion of a key packet to the decoded digital broadcast content, encryption of a video packet and/or an audio packet following the key packet, and encryption of the whole digital broadcast content with the key packet inserted thereto are executed in a secure LSI 400. The key packet includes information of encryption and decoding keys of the video packet and/or the audio packet following the key packet, time information or order information of the key packet, and hash values of the encryption and decoding keys and the time information or order information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a content moving apparatus that moves digital content received via digital broadcasting or the Internet securely, that is, without illegally being copied by a third party, from a receiving terminal to another terminal or a storage medium.

  In recent years, digitalization of television broadcasting has been progressing. However, unlike analog broadcast content, digital broadcast content does not deteriorate image quality even if it is copied many times. For this reason, the digital broadcast content is easily copied and may be distributed without permission on the Internet or the like. Such problems of copying digital broadcast contents and unauthorized distribution on the Internet or the like are very troublesome for the right holders of digital broadcast contents.

  For example, a personal computer (hereinafter referred to as a PC) includes a hard disk device (hereinafter referred to as an HDD) as a storage medium, and anyone can freely copy and view it. For this reason, if the digital broadcast content is stored in the HDD of the PC, there is a risk that it may be freely copied and viewed. There are HDDs (secure HDDs) that cannot be accessed without knowing a secret number in the world, but the cost is high, and there is a problem in cost to install in a home PC that handles digital broadcast contents.

  Therefore, it is becoming common to create a secure area (an area that cannot be peeped or tampered with by a third party) in the PC, and to securely process the received digital broadcast content. For example, in general, digital broadcast content stored in an HDD in a PC is encrypted, but security can be maintained by placing an encryption / decryption key in a secure area and performing encryption / decryption processing in the secure area.

  However, the secure area that can be set in the PC has weak points such as a smaller memory area and lower processing performance than a normal PC area. For example, when the secure area in the PC is realized as a dedicated LSI (secure LSI), the secure area is limited by the processing performance and memory area of the LSI.

  FIG. 9 is a diagram for explaining a conventional method of moving digital broadcast content between PCs. In FIG. 9, 100 and 200 are PCs, 101 is an HDD of the PC 100, 201 is an HDD of the PC 200, and 102 is a secure area of the PC 100. In this example, the digital broadcast content decrypted and re-encrypted by the tuner is stored in the HDD 101 of the PC 100, and the encryption / decryption key for decrypting the encrypted digital broadcast content 103 in the secure area 102 of the PC 100 is stored. 104 is stored.

  As described above, in this example, the encrypted digital broadcast content 103 is stored in the HDD 101 that can be freely copied, but since the encryption / decryption key 104 is stored in the secure area 102, the encrypted digital broadcast content 103 is stored in the secure area 102. Copying, falsification, and peeping of the broadcast content 103 are impossible, and only the secure area 102 of the PC 100 can perform decryption processing of the encrypted digital broadcast content 103.

Here, when the encrypted digital broadcast content 103 stored in the PC 100 is moved to the PC 200, in the conventional content movement method, first, the encrypted digital broadcast content 103 is transmitted to the PC 200 (S1). Since the digital broadcast content 103 is encrypted, this can be done by a normal moving method. Next, the encryption / decryption key 104 stored in the secure area 102 is transmitted to the PC 200 (S2). This must be performed by a secure communication that is not peeped or tampered with by a third party, such as a public key cryptosystem.
JP 2002-152490 A

  In the conventional method for moving digital broadcast content between PCs, when a line disconnection or power interruption occurs during transmission of the encrypted digital broadcast content 103 from the PC 100 to the PC 200, the PC 200 views the encrypted digital broadcast content 103. However, it is desirable for the viewer to be able to view the encrypted digital broadcast content that arrives at the PC 200. In addition, it is desirable for the right holder of digital broadcast content that the transmitted encrypted digital broadcast content cannot be viewed on the PC 100.

  For example, in the case where the encrypted digital broadcast content 103 is 60-minute content, if a line disconnection or power-off occurs when 30 minutes are transmitted to the PC 200, conventionally, the content for the first 30 minutes on the PC 200 However, it is desirable to be able to view the content for the first half 30 minutes that reaches the PC 200. Also, in the PC 100, it is desirable that the transmitted content for the first half 30 minutes cannot be viewed, and the content that can be viewed is the content for the second half 30 minutes that has not been transmitted.

  Further, when the encrypted digital broadcast content 103 is edited on the PC 100, it is desirable that the edited content cannot be viewed and other content can be viewed. For example, when editing is performed on a digital broadcast content including a CM so as to exclude the CM, it is desirable that the contents of the original digital broadcast content other than the CM cannot be viewed.

  In view of the above, the present invention provides a content moving apparatus capable of performing secure movement of digital content stored in a storage medium, and further, a moved portion of the digital content stored in the storage medium is It is an object of the present invention to provide a content moving device that cannot be reproduced.

  In the present invention, the content moving apparatus according to the first invention has means for inserting a predetermined packet including content alteration detection information when digital content is stored in a storage medium.

  In the present invention, the content transfer device according to the second aspect of the invention comprises means for calculating a hash value of part or all of information in a selected packet when digital content is stored in a storage medium, and the number of the selected packet. And a means for associating the hash value of part or all of the information in the selected packet with a predetermined file and storing it in a storage medium.

  According to the first aspect of the present invention, since the predetermined packet including the content alteration detection information is inserted when the digital content is stored in the storage medium, the authenticity of the content alteration detection information when the digital content is moved. By confirming, tampering of digital content can be detected. Therefore, the digital content can be moved securely.

  According to the second aspect of the present invention, when the digital content is stored in the storage medium, a hash value of part or all of the information in the selected packet is calculated, and the number of the selected packet and the selected number are selected. Since a predetermined file is stored in a storage medium in association with hash values of some or all of the information in the packet, tampering of the digital content is detected by checking the authenticity of the predetermined file when the digital content is moved be able to. Therefore, the digital content can be moved securely.

  Hereinafter, with reference to FIGS. 1 to 8, the first and second embodiments of the content moving apparatus according to the present invention will be described by taking as an example the case where digital content received via digital broadcasting is to be moved. However, the present invention can also be applied to a case where digital content received via the Internet is to be moved.

(First Embodiment of Content Transfer Device of the Present Invention)
FIG. 1 is a schematic configuration diagram of a content moving system using the first embodiment of the content moving apparatus of the present invention. The content transfer system shown in FIG. 1 is composed of a PC 300 and a secure large scale integrated circuit (LSI) 400 constituting the first embodiment of the content transfer apparatus of the present invention mounted on the PC 300.

  In the PC 300, reference numeral 301 denotes an HDD, which is used to store encrypted digital broadcast content encrypted by the secure LSI 400, permission information created by the secure LSI 400, and the like. An application 302 on the OS (operating system) of the PC 300 is secure LSI management software that manages the secure LSI 400. Reference numeral 303 denotes a PCI (peripheral component interconnect) bus.

  The secure LSI 400 includes (1) a function for performing processing such as encryption and decryption of received digital broadcast content within the license information, (2) a function for storing, managing, and updating license information in the HDD 301, and (3) A function for confirming the authenticity of the license information in the HDD 301, (4) a function for adding content alteration detection information to the received digital broadcast content, and (5) a function for performing content processing according to the content alteration detection information and the license information. It is what you have.

  In general, it is considered that the inside of a secure LSI cannot be peeped or tampered with. That is, it takes a great deal of money to peep inside or tamper with the inside of the secure LSI, which is considered impossible in practice. Therefore, in the content migration system shown in FIG. 1, a secure area is constructed by the secure LSI 400.

  In the secure LSI 400, 401 is a PCI interface for connecting the secure LSI 400 and the PCI bus 303 of the PC 300. Reference numeral 402 denotes a processor that executes a program necessary for the operation of the secure LSI 400 and controls each internal circuit unit.

  Reference numeral 403 denotes an SDRAM (synchronous DRAM [dynamic random access memory]) that is used by the processor 402. 404 is permission information management software installed in the secure LSI 400, and causes the processor 402 to execute processing such as creation of permission information, storage of the created permission information in the HDD 301, management, and update.

  Reference numeral 405 denotes a selection circuit that selects digital broadcast content to be decrypted from digital broadcast content encrypted in the MULTI2 format received by a tuner (not shown).

  Reference numeral 406 denotes a first decryption circuit for decrypting the digital broadcast content encrypted in the MULTI2 format output from the selection circuit 405 with a scramble key. A B-CAS (BS-Conditional Access Systems) card 407 holds a scramble key required by the first decryption circuit 406.

  Reference numeral 408 denotes an insertion circuit which inserts a key packet into the MPEG stream constituting the digital broadcast content output from the first decryption circuit 406. The key packet includes information for detecting falsification of the digital broadcast content when the digital broadcast content is encrypted and stored in the HDD 301 and then decrypted.

  Reference numeral 409 denotes a first encryption circuit, which inputs the digital broadcast content into which the key packet output from the insertion circuit 408 is inserted, and encrypts the video packet and / or audio packet following the key packet with a predetermined encryption key. Further, the entire MPEG stream including the key packet is encrypted with the content encryption key. The encrypted digital broadcast content output from the first encryption circuit 409 is stored in the HDD 301.

  The predetermined encryption key for encrypting the video packet and / or the audio packet following the key packet is included in the key packet as an encryption / decryption key, and the key packet and the subsequent video packet and / or audio packet are included. There is a link between them.

  A hash value generation circuit 410 generates a hash value (keyed hash) of an encryption / decryption key and time information or order information included in a key packet, or generates a hash value of permission information stored in the HDD 301. It is what you use. Reference numeral 411 denotes a flash memory for securely storing the hash value of the permission information generated by the hash value generation circuit 410.

  Reference numeral 412 denotes a second decryption circuit which decrypts the encrypted digital broadcast content read from the HDD 301 with a content encryption / decryption key. Reference numeral 413 denotes a second encryption circuit which encrypts the digital broadcast content output from the second decryption circuit 412 with the re-encryption key KB.

  In the content movement system shown in FIG. 1, when the digital broadcast content received by the tuner is stored in the HDD 301, the secure LSI 400 decrypts the digital broadcast content received by the tuner, inserts a key packet into the decrypted digital broadcast content, The video packet and / or audio packet following the packet is encrypted, and the entire digital broadcast content with the key packet inserted is encrypted.

  Specifically, the selection circuit 405 selects the digital broadcast content to be decoded from the digital broadcast content received by the tuner. Then, the first decryption circuit 406 decrypts the digital broadcast content output from the selection circuit 405 using the scramble key obtained from the B-CAS card 407. Since the scramble key is periodically updated, the processor 402 obtains a new scramble key from the B-CAS card 407 each time it is updated.

  Next, the insertion circuit 408 inserts the key packet into the MPEG stream constituting the digital broadcast content output from the first decryption circuit 406. Next, the first encryption circuit 409 encrypts the video packet and / or audio packet following the key packet with an encryption / decryption key including the key packet, and further decrypts the entire digital broadcast content into which the key packet has been inserted. Encrypt with key. Then, the encrypted digital broadcast content is stored in the HDD 301 via the PCI interface 401 and the PCI bus 303.

  FIG. 2 is a diagram showing a state of the digital broadcast content in which the key packet output from the insertion circuit 408 is inserted. In FIG. 2, 501 is a key packet, 502 and 503 are video packets, 504 is an audio packet, 505 is a video packet, 506 is a key packet, and 507 and 508 are video packets. The key packet is inserted every few seconds, for example.

  FIG. 3 is a diagram illustrating a first configuration example of the key packet. The key packet of the first configuration example includes information on the encryption / decryption key of the subsequent video packet and / or audio packet, time information of the key packet (for example, the time when the received packet has arrived), and these encryption / decryption key and time. It includes a hash value (keyed hash) of information.

  FIG. 4 is a diagram illustrating a second configuration example of the key packet. The key packet of the second configuration example includes the encryption / decryption key information of the video packet and / or audio packet that follows, the order information of the key packet, and the hash value (keyed hash) of these encryption / decryption keys and order information. Including.

  As described above, the key packet includes information on the encryption / decryption key obtained by encrypting the subsequent video packet and / or audio packet. As a result, the key packet and the subsequent digital broadcast content are linked. It is a set. Therefore, even if only the key packet is changed, the digital broadcast content cannot be decrypted. Also, even if the key packet and the subsequent digital broadcast content are set, and the order or location is changed for each set, if the time information or order information of the key packet is confirmed, the order of the contents can be easily altered. I understand.

  Further, in the content moving system shown in FIG. 1, the first encryption circuit 409 encrypts the content encryption / decryption key used for encrypting the digital broadcast content with the master key that does not leave the secure LSI 400 to the outside. Information for specifying broadcast contents is stored as permission information in the HDD 301, and further, a hash value of permission information stored in the HDD 301 is stored in the flash memory 411.

  FIG. 5 is a diagram showing a configuration of permission information stored in the HDD 301. In this example, the license information has the license information name as the title, the content name of the digital broadcast content stored in the HDD 301, a content encryption / decryption key necessary for decrypting the digital broadcast content, and the digital broadcast content are reproduced. It is configured and stored as a table of reproducible ranges that are allowed. The reproducible range can be specified by time information or order information included in the key packet, for example.

  FIG. 6 is a diagram showing a storage format of the hash value of the permission information in the flash memory 411. The hash value of the license information stored in the flash memory 411 is stored as a table of the license information name and the hash value of the license information. The hash value of the permission information in the flash memory 411 is a value that is updated (recalculated) every time the permission information is updated. The hash value of the license information in the flash memory 411 is updated in order to prevent the license information in the HDD 301 from being copied and processing content with license information other than the latest one. The hash value of the latest license information is saved.

  The reason why the content encryption / decryption key is not stored in the secure LSI 400 is that the capacity of the flash memory 411 that can be mounted in the secure LSI 400 is limited, and if too many content encryption / decryption keys are stored, the capacity of the flash memory 411 is insufficient. is there. On the other hand, if the license information including the content encryption / decryption key is stored in the form of a hash value, only the hash value needs to be stored, and the restriction on the memory capacity of the secure LSI 400 can be greatly relaxed.

  In the content movement system shown in FIG. 1, when the digital broadcast content stored in the HDD 301 is moved to another PC, the following processes P1 to P8 are executed in order.

  (P1) The license information is read from the HDD 301 to the secure LSI 400. (P2) The authenticity of the license information read from the HDD 301 to the secure LSI 400 is confirmed with the hash value of the license information in the flash memory 411. (P3) The content encryption / decryption key is decrypted from the permission information read from the HDD 301 to the secure LSI 400.

  (P4) A re-encryption key KB is generated for moving the digital broadcast content body to another PC. (P5) The generated re-encryption key KB is securely transmitted from the secure LSI 400 to another PC by, for example, a public encryption key method. (P6) The encrypted digital broadcast content is read from the HDD 301 to the secure LSI 400, decrypted with the content encryption / decryption key in the second decryption circuit 412, and further encrypted with the re-encryption key KB in the second encryption circuit 413. Send to other PCs in units.

  (P7) Every time digital broadcast content is transmitted to another PC in 1 minute units, the reproducible range in the license information is updated. For example, when 60 minutes of encrypted digital broadcast content exists in the HDD 301, if the first minute is transmitted to another PC, the first minute of the encrypted digital broadcast content remaining in the HDD 301 is excluded from the playable range. The remaining 59 minutes are set as a reproducible range.

  (P8) Each time the license information is updated in this way, the license information is stored in the HDD 301, and the hash value of the license information in the flash memory 411 is updated. Then, when it comes to the end of the moving digital broadcast content for one minute, this operation is completed. Thereafter, each time the digital broadcast content is transmitted for one minute, the processes P7 and P8 are repeated.

  As described above, in the secure LSI 400 (first embodiment of the content moving apparatus of the present invention), when the PC 300 moves the digital broadcast content to another PC, after transmitting the re-encryption key KB to the other PC, Each time digital broadcast content is transmitted to another PC in units of one minute, a process of updating the reproducible range of the license information in the HDD 301 and newly storing the latest license information is performed.

  Therefore, when a line disconnection or power interruption occurs during transmission of digital broadcast content from the PC 300 to another PC, the encrypted digital broadcast content that arrives at the other PC is decrypted using the re-encryption key KB. Thus, viewing can be performed by performing decryption using the encryption / decryption key in the key packet, and the PC 300 cannot view the transmitted digital broadcast content, protecting the right holder of the digital broadcast content and the viewer's Coordination with protection can be achieved.

  Further, according to the secure LSI 400 (the first embodiment of the content moving apparatus of the present invention), the hash value of the latest license information stored in the HDD 301 is stored in the flash memory 411, and the encrypted digital broadcast content is stored from the HDD 301. When the second decryption circuit 412 reads and decrypts the permission information in the HDD 301 with the hash value of the permission information in the flash memory 411, the authenticity of the permission information can be confirmed. It is possible to detect illegal peeping, copying and falsification, and to strengthen protection of the right holder of digital broadcasting content.

  Further, according to the secure LSI 400 (the first embodiment of the content moving apparatus of the present invention), a key packet is inserted into the received and decrypted digital broadcast content, and a video packet following the key packet and / or Or the audio packet encryption / decryption key and the time information or order information of the key packet, and further the video packet and / or audio packet encryption / decryption key following the key packet and the hash value of the time information or order information of the key packet Is going to be included.

  Therefore, when the encrypted digital broadcast content is read from the HDD 301 and decrypted by the second decryption circuit 412, the video packet and / or audio packet encryption / decryption key following the key packet in the key packet and the time information of the key packet or By comparing the order information with the encryption / decryption key of the video packet and / or audio packet following the key packet in the key packet, the time information of the key packet or the hash value of the order information, the time information or the order information is falsified. It can be detected and the protection of the right holder of the digital broadcast content can be enhanced.

(Second Embodiment of Content Transfer Device of the Present Invention)
FIG. 7 is a schematic configuration diagram of a content moving system using the second embodiment of the content moving apparatus of the present invention. The content moving system shown in FIG. 7 includes the PC 300 described above and a secure LSI 600 constituting the second embodiment of the content moving apparatus of the present invention mounted on the PC 300.

  The secure LSI 600 includes (1) a function for performing processing such as encryption and decryption of received digital broadcast content within the license information, (2) a function for storing, managing, and updating license information in the HDD 301, and (3) A function for confirming the authenticity of permission information in the HDD 301, (4) a function for generating content alteration detection information and storing it in the HDD 301, (5) a function for confirming the authenticity of content alteration detection information in the HDD 301, and (6) content. It has a function of performing content processing in accordance with falsification detection information and permission information.

  In the secure LSI 600, reference numeral 601 denotes a PCI interface for connection between the secure LSI 600 and the PCI bus 303 of the PC 300. Reference numeral 602 denotes a processor which executes a program necessary for the operation of the secure LSI 600 and controls each internal circuit unit.

  Reference numeral 603 denotes an SDRAM which is used by the processor 602. 604 is permission information management software installed in the secure LSI 600, and causes the processor 602 to execute processing such as creation of permission information, storage of the created permission information in the HDD 301, management, and update.

  Reference numeral 605 denotes a selection circuit for selecting a digital broadcast content to be decrypted from digital broadcast content encrypted in the MULTI2 format received by a tuner (not shown).

  Reference numeral 606 denotes a first decryption circuit for decrypting the digital broadcast content encrypted in the MULTI2 format output from the selection circuit 605 with a scramble key. A B-CAS card 607 holds a scramble key required by the first decryption circuit 606.

  Reference numeral 608 denotes a first encryption circuit, which encrypts digital broadcast content output from the first decryption circuit 606 with a content encryption / decryption key. The encrypted digital broadcast content output from the first encryption circuit 608 is stored in the HDD 301.

  Reference numeral 609 denotes a counter that counts the number of packets in the MPEG stream constituting the digital broadcast content output from the first decoding circuit 606. A selection circuit 610 receives a count value of the counter 609 and periodically selects a digital broadcast content packet output from the first decoding circuit 606.

  A hash value generation circuit 611 is used when generating a hash value of permission information stored in the HDD 301, or when calculating a hash value of a part or all of information in a packet selected by the selection circuit 610. It is. Reference numeral 612 denotes a flash memory for securely storing the hash value generated by the hash value generation circuit 611.

  Reference numeral 613 denotes a second decryption circuit that decrypts the encrypted digital broadcast content read from the HDD 301 with the content encryption / decryption key. Reference numeral 614 denotes a second encryption circuit which encrypts the digital broadcast content output from the second decryption circuit 613 with the re-encryption key KB.

  In the content movement system shown in FIG. 7, when the digital broadcast content received by the tuner is stored in the HDD 301, the secure LSI 600 uses the decryption of the digital broadcast content received by the tuner and the content encryption / decryption key of the decrypted digital broadcast content. A process called encryption is executed.

  Specifically, the selection circuit 605 selects the digital broadcast content to be decoded from the digital broadcast content received by the tuner. Then, the first decryption circuit 606 decrypts the digital broadcast content output from the selection circuit 605 using the scramble key obtained from the B-CAS card 607. Since the scramble key is periodically updated, the processor 602 obtains a new scramble key from the B-CAS card 607 each time it is updated.

  Further, the counter 609 counts the number of MPEG packets constituting the digital broadcast content output by the first decoding circuit 606, and the selection circuit 610 receives the count value output by the counter 609, and the first decoding circuit 606 The MPEG packet constituting the digital broadcast content to be output is selected periodically.

  Then, in the hash value generation circuit 611, the hash value of some or all of the data in the packet selected by the selection circuit 610 is calculated, the hash value is associated with the packet number and stored in the HDD 301 as a separate file, and The hash value of another file is calculated and stored in the flash memory 612 in association with the other file name.

  Further, in the content movement system shown in FIG. 7, the content encryption / decryption key used by the first encryption circuit 608 for encrypting the digital broadcast content is encrypted with a master key that is not output from the secure LSI 600 to the encrypted digital Information for specifying broadcast content is stored in the HDD 301 as permission information, and a hash value of the permission information stored in the HDD 301 is stored in the flash memory 612.

  FIG. 8 is a diagram showing a configuration of permission information stored in the HDD 301. In this example, the license information has the license information name as the title, the content name of the digital broadcast content stored in the HDD 301, a content encryption / decryption key necessary for decrypting the digital broadcast content, and the digital broadcast content are reproduced. It is configured and stored as a table of the reproducible range that is allowed and the names of other files created for the digital broadcast content. The reproducible range can be specified by a packet number included in another file, for example.

  Further, the storage format of the hash value of the permission information in the flash memory 612 is the same as shown in FIG. The hash value of the license information in the flash memory 612 is a value that is updated (recalculated) every time the license is updated. The hash value of the license information in the flash memory 411 is updated in order to prevent the license information in the HDD 301 from being copied and processing content with license information other than the latest license information. Always stores the hash value of the latest license information.

  In the content movement system shown in FIG. 7, when the digital broadcast content stored in the HDD 301 is moved to another PC, the following processes Q1 to Q8 are executed in order.

  (Q1) The license information is read from the HDD 301 to the secure LSI 600. (Q2) The authenticity of the license information read from the HDD 301 to the secure LSI 600 is confirmed with the hash value of the license information in the flash memory 612. (Q3) The content encryption / decryption key is decrypted from the permission information read from the HDD 301 to the secure LSI 600. At this time, another file is read from the HDD 301 and decrypted, and when the packet numbers match, the hash value of the other file in the flash memory 612 is checked and tampering is checked.

  (Q4) A re-encryption key KB for moving the digital broadcast content body is generated. (Q5) The generated re-encryption key KB is securely transmitted from the secure LSI 600 to another PC by, for example, a public encryption key method. (Q6) The encrypted digital broadcast content is read from the HDD 301 to the secure LSI 600, decrypted with the content encryption / decryption key in the second decryption circuit 613, and further encrypted with the re-encryption key KB in the second encryption circuit 614. Send to the destination PC in units.

  (Q7) The reproducible range in the license information is updated every time digital broadcast content is transmitted to the partner PC in 1 minute units. For example, when 60 minutes of encrypted digital broadcast content exists in the HDD 301, if the first minute is transmitted to another PC, the first minute of the encrypted digital broadcast content remaining in the HDD 301 is excluded from the playable range. The remaining 59 minutes are set as the reproducible range.

  (Q8) Each time the license information is updated in this way, the license information is stored in the HDD 301, and the hash value of the license information in the flash memory 612 is updated. Then, when it comes to the end of the moving digital broadcast content for one minute, this operation is completed. Thereafter, each time digital broadcast content is transmitted for one minute, processes Q7 and Q8 are repeated.

  As described above, in the secure LSI 600 (second embodiment of the content movement apparatus of the present invention), when the PC 300 moves the digital broadcast content to another PC, after transmitting the re-encryption key KB to the other PC, Each time digital broadcast content is transmitted to another PC in units of one minute, a process of updating the reproducible range of the license information in the HDD 301 and newly storing the latest license information is performed.

  Therefore, when a line disconnection or power interruption occurs during transmission of digital broadcast content from the PC 300 to another PC, the encrypted digital broadcast content that arrives at the other PC is decrypted using the re-encryption key KB. Thus, viewing can be performed by performing decryption using the encryption / decryption key in the key packet, and the PC 300 cannot view the transmitted digital broadcast content, protecting the right holder of the digital broadcast content and the viewer's Coordination with protection can be achieved.

  Further, according to the secure LSI 600 (the second embodiment of the content moving apparatus of the present invention), the hash value of the latest permission information stored in the HDD 301 is stored in the flash memory 612, and the encrypted digital broadcast content is stored from the HDD 301. When read and decrypted by the second decryption circuit 613, the permission information in the HDD 301 can be checked against the hash value of the permission information in the flash memory 612 to confirm the authenticity of the permission information. It is possible to detect illegal peeping, copying and falsification of the content, and to strengthen protection of the right holder of the digital broadcast content.

  Further, according to the secure LSI 600 (the second embodiment of the content movement method of the present invention), the counter 609 counts the number of MPEG packets constituting the digital broadcast content output from the first decryption circuit 606, and selects the selection circuit 610. In response to the count value output from the counter 609, the MPEG packet constituting the digital broadcast content output from the first decoding circuit 606 is periodically selected, and the hash value generation circuit 611 selects the packet selected by the selection circuit 610. The hash value of some or all of the data is calculated, the hash value is stored in the HDD 301 as a separate file, and the hash value of the separate file is calculated and stored in the flash memory 612 in association with the separate file name. It is said.

  Therefore, when the digital broadcast content is read from the HDD 301 and decrypted by the second decryption circuit 613, the authenticity of the separate file can be confirmed by comparing the separate file in the HDD 301 with the separate file in the flash memory 612. Tampering of digital broadcast content can be detected, and protection of the right holder of digital broadcast content can be strengthened. It should be noted that the selection of a packet for creating another file may be performed at random.

  Here, the license information created in the first and second embodiments of the content moving apparatus of the present invention has a fixed format, is not flexible, and cannot cope with a format change of the license information. .

  Therefore, the secure LSI management software 302 passes “license information”, “specific content encryption / decryption key position information”, and “specific content reproducible range designation position information” to the secure LSI 400 and 600, and the “license information” is transmitted to the secure LSI 400. , The content processing may be performed on the 600 side without reference to the hash value. In this case, even if the format of the permission information changes, the content is determined by the “specific content encryption / decryption key position information” and “specific content reproducible range designation position information” passed from the secure LSI management software 302. Processing can be performed.

  In addition, the secure LSI management software 302 provides the secure LSIs 400 and 600 with permission information, specific content content encryption / decryption key arithmetic expression, specific content content encryption / decryption key arithmetic variable position information, and specific content reproducible range arithmetic expression. Alternatively, the variable position information for the reproducible range calculation of the specific content may be passed, and the content processing may be performed by comparing the permission information with the hash value without permission on the secure LSI 400, 600 side.

  In this case, even if the format of the permission information changes, the content encryption / decryption key calculation formula for the specific content passed from the secure LSI management software 302, the variable location information for content encryption / decryption key calculation of the specific content, The content processing can be performed by obtaining the content encryption / decryption key and the reproducible range from the reproducible range arithmetic expression of the specific content and the variable position information for reproducible range calculation of the specific content.

  In addition, the secure LSI management software 302 passes the license information, the calculation part of the license information, and the calculation expression of the calculation part of the license information to the secure LSIs 400 and 600, and the secure LSI 400 and 600 side compares the license information with the hash value without permission. In addition, content processing may be performed by obtaining a content encryption / decryption key and a reproducible range.

  Here, when the content moving device of the present invention is arranged, the content moving device of the present invention includes at least the following content moving devices.

  (Supplementary Note 1) A content moving apparatus comprising means for inserting a predetermined packet including information for detecting content alteration when storing digital content in a storage medium.

  (Supplementary note 2) The content moving apparatus according to supplementary note 1, wherein the digital content is received and decrypted digital content.

  (Supplementary note 3) The content moving apparatus according to supplementary note 1 or 2, wherein the content alteration detection information is time information or order information of the predetermined packet.

  (Additional remark 4) It has a means to encrypt the digital content following the said predetermined packet with a predetermined key, The said predetermined packet contains the information of the said predetermined key, and the information of the said predetermined key, the said time information, or the said order The content moving apparatus according to appendix 3, wherein the content moving apparatus includes a hash value of information.

  (Supplementary note 5) The content moving apparatus according to supplementary note 1, 2, 3 or 4, further comprising means for encrypting the entire digital content to which the predetermined packet has been added with a content key and storing it in the storage medium.

  (Supplementary Note 6) When decrypting the digital content stored in the storage medium, the information of the predetermined key included in the predetermined packet in the digital content stored in the storage medium is converted to the credibility of the time information or the order information. The content moving apparatus according to claim 5, further comprising means for confirming the predetermined key information and the time information or the hash value of the order information.

  (Supplementary Note 7) Means for creating permission information in which a content name of a digital content stored in the storage medium, a content encryption / decryption key, and a reproducible range are associated, and means for storing the permission information in the storage medium The content moving apparatus according to appendix 5 or 6, further comprising means for storing the hash value of the permission information by itself.

  (Supplementary Note 8) Means for calculating a hash value of a part or all of information in a selected packet when digital content is stored in a storage medium, a number of the selected packet, a part of the selected packet, or A content moving apparatus comprising means for associating hash values of all information and storing them in a storage medium as a predetermined file.

  (Supplementary note 9) The content moving apparatus according to supplementary note 8, further comprising means for encrypting the digital content and storing it in the storage medium.

  (Supplementary note 10) The content moving apparatus according to supplementary note 8 or 9, comprising means for calculating a hash value of the predetermined file and means for storing the hash value of the predetermined file.

  (Additional remark 11) It has a means to confirm the authenticity of the said predetermined file accumulate | stored in the said storage medium with the hash value of the said predetermined file when decoding the digital content accumulate | stored in the said storage medium Content moving device.

  (Supplementary Note 12) Means for creating permission information in which a content name of a digital content stored in the storage medium, a content encryption / decryption key, a reproducible range, and a name of the predetermined file are associated, and the permission information 12. The content moving apparatus according to appendix 9, 10 or 11, further comprising means for storing in a storage medium and means for storing the hash value of the permission information by itself.

  (Supplementary note 13) Supplementary note 7 or 12 comprising means for confirming the authenticity of the license information stored in the storage medium with the hash value of the license information when the digital content stored in the storage medium is decrypted. The content moving device described.

  (Supplementary note 14) The digital content stored in the storage medium is decrypted and re-encrypted, and each time a part of the digital content is moved, new permission information in which the reproducible range in the permission information is rewritten is stored in the storage medium. 13. The content moving apparatus according to appendix 7 or 12, characterized by comprising means for:

  (Supplementary note 15) Any one of Supplementary notes 1 to 14, wherein permission information, content encryption / decryption key position information of the specific content, and playable range designation position information of the specific content are passed from the outside. The content moving device according to 1.

  (Supplementary Note 16) From the outside, permission information, content encryption / decryption key arithmetic expression for specific content, content encryption / decryption key arithmetic variable position information for the specific content, reproducible range arithmetic expression for the specific content, and the specific 15. The content moving apparatus according to any one of supplementary notes 1 to 14, wherein variable position information for content reproducible range calculation is passed.

  (Supplementary note 17) According to any one of Supplementary notes 1 to 14, wherein the license information, the calculation part information of the license information, and the calculation formula of the calculation part of the license information are passed from the outside. Content moving device.

1 is a schematic configuration diagram of a content movement system using a first embodiment (secure LSI) of a content movement apparatus of the present invention. It is a figure which shows the mode of the digital broadcast content in which the key packet output from the insertion circuit with which 1st Embodiment (secure LSI) of the content movement apparatus of this invention is provided was inserted. It is a figure which shows the 1st structural example of the key packet which 1st Embodiment (secure LSI) of the content movement apparatus of this invention produces. It is a figure which shows the 2nd structural example of the key packet which 1st Embodiment (secure LSI) of the content movement apparatus of this invention produces. It is a figure which shows the structure of the permission information produced with 1st Embodiment (secure LSI) of the content movement apparatus of this invention. It is a figure which shows the preservation | save format to the flash memory of the hash value of the permission information produced with 1st Embodiment (secure LSI) of the content movement apparatus of this invention. It is a schematic block diagram of the content movement system which uses 2nd Embodiment (secure LSI) of the content movement apparatus of this invention. It is a figure which shows the structure of the permission information produced with 2nd Embodiment (secure LSI) of the content movement apparatus of this invention. It is a figure for demonstrating the conventional digital broadcast content movement method between PC.

Explanation of symbols

300 ... PC (personal computer)
301 ... HDD (Hard Disk Device)
302 ... Secure LSI management software 303 ... PCI bus 400 ... Secure LSI (first embodiment of content transfer apparatus of the present invention)
401 ... PCI interface 402 ... Processor 403 ... SDRAM
404: license information management software 405 ... selection circuit 406 ... first decryption circuit 407 ... B-CAS card 408 ... insertion circuit 409 ... first encryption circuit 410 ... hash value generation circuit 411 ... flash memory 412 ... second decryption circuit 413 ... Second encryption circuit 600... Secure LSI (second embodiment of content moving apparatus of the present invention)
601 ... PCI interface 602 ... processor 603 ... SDRAM
604 ... Permission information management software 605 ... Selection circuit 606 ... First decryption circuit 607 ... B-CAS card 608 ... First encryption circuit 609 ... Counter 610 ... Selection circuit 611 ... Hash value generation circuit 612 ... Flash memory 613 ... Second decryption Circuit 614 ... second encryption circuit

Claims (5)

  A content moving apparatus comprising means for inserting a predetermined packet including content alteration detection information when digital content is stored in a storage medium.   The content moving apparatus according to claim 1, wherein the content alteration detection information is time information or order information of the predetermined packet. Means for encrypting digital content following the predetermined packet with a predetermined key;
3. The content transfer apparatus according to claim 2, wherein the predetermined packet includes information on the predetermined key, and includes information on the predetermined key and a hash value of the time information or the order information. Means for calculating a hash value of some or all of the information in the selected packet when storing the digital content in the storage medium;
A content moving apparatus comprising: means for associating the number of the selected packet with a hash value of part or all of the information in the selected packet and storing it in a storage medium as a predetermined file. Means for calculating a hash value of the predetermined file;
5. The content moving apparatus according to claim 4, further comprising means for storing a hash value of the predetermined file.

Images