Data transfer system, data transfer apparatus, data-recording apparatus, data management method, identifier generation method

• US 20040015713A1
• Filed: 07/28/2003
• Published: 01/22/2004
• Est. Priority Date: 06/13/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Tanaka, Masao, Matsuda, Hiromi, Abe, Miki, Hosoi, Takafumi
• Granted Patent: US 7,350,238 B2
• Time in Patent Office: Days
• US Class Current: 713/200
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2221/2103 Challenge-response
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00115 wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/00166 involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software
• CPC Class Codes: G11B 20/00181 using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]
• CPC Class Codes: G11B 20/00195 using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00224 wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/0071 involving a purchase action
• CPC Class Codes: G11B 20/00724 wherein a prepaid credit balance is registered on the recording medium
• CPC Class Codes: G11B 20/00855 involving a step of exchanging information with a remote server
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 20/1251 for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/218 Write-once discs
• CPC Class Codes: G11B 2220/2529 Mini-discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 2220/2575 DVD-RAMs
• CPC Class Codes: G11B 27/034 : on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/105 : of operating discs
• CPC Class Codes: H04L 2463/101 : applying security measures for digital rights management
• CPC Class Codes: H04L 63/0428 : wherein the data content is protected, e.g. by encrypting or encapsulating the payload

Abstract

A data transfer system provided by the present invention is capable of executing proper management of content transfers with a high degree of efficiency. In a data transfer apparatus employing a primary recording medium, rights to transfer contents stored in a primary recording medium are managed, and transfer rights of contents already transferred to a secondary recording medium employed in a data-recording apparatus are managed by using a generated table for associating first content identifiers each generated by the data transfer apparatus for a content stored in the primary recording medium with a second content identifier received from the data-recording apparatus and generated by the data-recording apparatus for the content, which has already been transferred to the data-recording apparatus. Thus, even if the secondary recording medium cannot be used for recording a second content identifier (or a content ID), a content ID (a second content identifier) generated for a content can be used for identifying the content by associating the content ID (the second content identifier) with a content ID (a first content identifier) stored in the primary recording medium.

Claims

1. :

A data transfer system comprising a data transfer apparatus and a data-recording apparatus wherein;

said data transfer apparatus comprises;

primary-recording-medium driving means for recording and reproducing data onto and from a primary recording medium;

storage controlling means for controlling said primary-recording-medium driving means to store content data in an encrypted state and a first content identifier generated uniquely to said content data onto said primary recording medium;

communication means for carrying out a variety of data communications including transfers of content data with said data-recording apparatus; and

transfer management means for managing rights to transfer content data and for managing transfer rights of content data already transferred to said secondary recording medium by using a generated table for associating said first content identifier with a second content identifier received from said data-recording apparatus and generated by said data-recording apparatus for said content data already transferred to said data-recording apparatus, whereas

said data-recording apparatus comprises;

communication means for carrying out data communications including exchanges of content data with said data transfer apparatus;

secondary-recording-medium driving means for recording and reproducing data onto and from said secondary recording medium;

decryption means for decrypting encrypted content data received from said data transfer apparatus, putting said content data in an unencrypted state;

recording controlling means for controlling said secondary-recording-medium driving means to record said encrypted content data decrypted by said decryption means onto said secondary recording medium;

identifier generation means for generating a second content identifier of said content data from said content data in said unencrypted state; and

identifier-transmission controlling means for requesting said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.

2. :

A data transfer system according to claim 1 wherein said transfer management means manages said rights to transfer content data by managing the number of allowable transfers of content data to said data-recording apparatus.

3. :

A data transfer system according to claim 1 wherein, when a right to reproduce content data from said secondary recording medium is lost for said content data recorded on said secondary recording medium, said transfer management means requests said data-recording apparatus to transmit said second content identifier generated for said content data and, after using said table for collation of said second content identifier received from said data-recording apparatus, updates said right to transfer said content data.

4. :

A data transfer system according to claim 1 wherein said identifier generation means extracts a portion of said content data from a sampling point determined on the basis of the length of said content data, and generates a second content identifier by carrying out a process using said extracted portion.

5. :

A data transfer system according to claim 4 wherein a point or a plurality of points other than a start and an end of content data are used as said sampling points for generating a second content identifier of said content data.

6. :

A data transfer system according to claim 1 wherein;

when said content data is received from said data transfer apparatus, said identifier generation means extracts a portion from said sampling point in said content data on a data path ending with an operation to record said content data decrypted by said decryption means onto said secondary recording medium, and generates a second content identifier by carrying out a process using said extracted portion; and

upon completion of a transfer of said content data from said data transfer apparatus, said identifier-transmission controlling means requests said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.

7. :

A data transfer system according to claim 1 wherein, with said secondary recording medium for recording contents mounted on said data-recording apparatus;

said secondary-recording-medium driving means reproduces a portion from a sampling point in one of said contents recorded in said secondary recording medium and stores said portion in a storage means in advance for each of said contents;

when a request for said second content identifier of one of said contents recorded in said secondary recording medium is received from said data transfer apparatus,

said identifier generation means generates said second content identifier by carrying out a process using extracted portion of said sampling point already stored in said storage means; and

said identifier-transmission controlling means requests said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.

8. :

A data transfer system according to claim 1 wherein, with said secondary recording medium for recording contents mounted on said data-recording apparatus;

said secondary-recording-medium driving means reproduces a portion from a sampling point in one of said contents data recorded in said secondary recording medium,

said identifier generation means uses said reproduced portion in a process to generate said second content identifier to be stored in a storage means in advance for each of said contents; and

when a request for said second content identifier of one of said contents recorded in said secondary recording medium is received from said data transfer apparatus,

said identifier-transmission controlling means requests said communication means to transmit said second content identifier already stored in said storage means to said data transfer apparatus.

9. :

A data transfer apparatus comprising;

primary-recording-medium driving means for recording and reproducing data onto and from a primary recording medium;

storage controlling means for storing encrypted content data and first content identifier generated inherently for the content data onto said primary recording medium;

communication means for carrying out a variety of data communications including transfers of content data with an external data-recording apparatus; and

transfer management means for managing rights to transfer content data and for managing transfer rights of content data already transferred to said external data-recording apparatus by using a generated table for associating said first content identifier with a second content identifier received from said external data-recording apparatus and generated by said data-recording apparatus for said content data already transferred to said data-recording apparatus.

10. :

A data transfer apparatus according to claim 9 wherein said transfer management means manages said rights to transfer content data by managing the number of allowable transfers of content data to said external data-recording apparatus.

11. :

A data transfer apparatus according to claim 9 wherein, when a right to reproduce content data from said secondary recording medium is lost for said content data recorded on said secondary recording medium, said transfer management means requests said external data-recording apparatus to transmit said second content identifier generated for said content data and, after using said table for collation of said second content identifier received from said data-recording apparatus, updates said right to transfer said content data.

12. :

A data-recording apparatus comprising;

communication means for carrying out data communications including exchanges of content data with an external data transfer apparatus;

secondary-recording-medium driving means for recording and reproducing data onto and from a secondary recording medium;

decryption means for decrypting encrypted content data received from said external data transfer apparatus, putting said content data in an unencrypted state;

recording controlling means for controlling said secondary-recording-medium driving means to record said encrypted content data decrypted by said decryption means onto said secondary recording medium;

identifier generation means for generating a content identifier from said content data in said unencrypted state; and

identifier-transmission controlling means for requesting said communication means to transmit said content identifier generated by said identifier generation means to said external data transfer apparatus.

13. :

A data-recording apparatus according to claim 12 wherein said identifier generation means extracts a portion of said content data from a sampling point determined on the basis of the length of said content data, and generates a content identifier by carrying out a process using said extracted portion.

14. :

A data-recording apparatus according to claim 13 wherein a point or a plurality of points other than a start and an end of content data are used as said sampling points for generating a content identifier of said content data.

15. :

A data-recording apparatus according to claim 12 wherein;

when said content data is received from said external data transfer apparatus,

said identifier generation means extracts a portion from said sampling point in said content data on a data path ending with an operation to record said content data decrypted by said decryption means onto said secondary recording medium, and generates a second content identifier by carrying out a process using said extracted portion; and

said identifier-transmission controlling means, upon completion of a transfer of said content data from said external data transfer apparatus, requests said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.

16. :

A data-recording apparatus according to claim 12 wherein, with said secondary recording medium for recording contents mounted on said data-recording apparatus;

said secondary-recording-medium driving means reproduces a portion from a sampling point in one of said contents recorded in said secondary recording medium and stores said portion in a storage means in advance for each of said contents;

when a request for said second content identifier of one of said contents recorded in said secondary recording medium is received from said external data transfer apparatus,

said identifier generation means generates said second content identifier by carrying out a process using said extracted portion of sampling point already stored in said storage means; and

said identifier-transmission controlling means requests said communication means to transmit said second content identifier generated by said identifier generation means to said data transfer apparatus.

17. :

A data-recording apparatus according to claim 12 wherein, with said secondary recording medium for recording contents mounted on said data-recording apparatus;

said secondary-recording-medium driving means reproduces a portion from a sampling point in one of said contents data recorded in said secondary recording medium;

said identifier generation means uses said reproduced portion in a process to generate said second content identifier to be stored in a storage means in advance for each of said contents; and

when a request for said second content identifier of one of said contents recorded in said secondary recording medium is received from said external data transfer apparatus,

said identifier-transmission controlling means requests said communication means to transmit said second content identifier already stored in said storage means to said data transfer apparatus.

18. :

A data management method for managing transfer rights of encrypted content data recorded on a primary recording medium to a secondary recording medium, said data management method comprising the steps of;

managing rights to transfer said content data by associating said content data with a first content descriptor generated for said content data; and

managing transfer rights of content data already transferred to said secondary recording medium by using a generated table for associating said first content identifier with a second content identifier received from said secondary recording-medium apparatus and generated by said secondary recording-medium apparatus for said content data already transferred to said secondary recording-medium apparatus.

19. :

A data management method according to claim 18 whereby said rights to transfer content data are managed by managing the number of allowable transfers of content data to said secondary recording medium.

20. :

A data management method according to claim 18 whereby, when a right to reproduce content data from said secondary recording medium is lost for said content data recorded on said secondary recording medium, a secondary-recording-medium apparatus employing said secondary recording medium is requested to transmit said second content identifier generated for said content data and, after said table is used for collation of said second content identifier received from said secondary-recording-medium apparatus, said right to transfer said content data is updated.

21. :

An identifier generation method whereby a portion of said content data is extracted from a sampling point determined on the basis of the length of said content data, and a content identifier is generated by carrying out a process using said extracted portion.

22. :

An identifier generation method according to claim 21 whereby a point or a plurality of points other than a start and an end of content data are used as said sampling points for generating a content identifier of said content data.

23. :

An identifier generation method according to claim 21 whereby, as part of operations to receive said encrypted content data, decrypt said received encrypted content data into an unencrypted state and record said content data in said unencrypted state onto said secondary recording medium, a portion is extracted in advance from said sampling point in said content data, and a second content identifier is generated by carrying out a process using said extracted portion in processes on a data path ending with an operation to record said decrypted content data onto said secondary recording medium.

24. :

An identifier generation method according to claim 21 whereby, for contents already recorded on said secondary recording medium, a portion is reproduced from a sampling point in one of said contents recorded on said secondary recording medium and stored in a storage means in advance for each of said contents prior to reception of a request for a content identifier from an external apparatus; and

when a request for said content identifier of one of said contents recorded in said recording medium is received from said external apparatus, said content identifier is generated by carrying out a process using extracted portion of said sampling point already stored in said storage means.

25. :

An identifier generation method according to claim 21 whereby, for contents data already recorded on said recording medium, a portion is reproduced from a sampling point in one of said contents recorded in said recording medium and used in a process to generate said content identifier to be stored in a storage means in advance for each of said contents prior to reception of a request for a content identifier from an external apparatus.