Encoding and recording apparatus, playback apparatus, and program

• US 20050213767A1
• Filed: 04/18/2005
• Published: 09/29/2005
• Est. Priority Date: 10/18/2002
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Solutions Corporation (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Solutions Corporation (Toshiba Corporation)
• Inventors: Kasahara, Akihiro, Suu, Hiroshi, Kato, Taku, Matsukawa, Shinichi
• Granted Patent: US 8,204,226 B2
• Time in Patent Office: Days
• US Class Current: 380/277
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0853 using an additional device, e.g. smartcard, SIM or a different communication terminal cryptographic mechanisms or cryptographic arrangements for entity authentication involving additional secure or trusted devices H04L9/3234
• CPC Class Codes: H04L 9/0894 Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage

Abstract

The present invention relates to an encoding and recording apparatus, a playback apparatus, and a program which solve the possibility of a capacity shortage of a protected area accompanying an increase in an information amount and the number of content keys. It is configured such that an encoded user identifier is recorded in a protected area of a key storage medium. The encoded user identifier is fixed information, and has the characteristic in which a data amount is not increased in connection with a utilization form. Therefore, a capacity shortage of the protected area is not brought about.

Claims

1. An encoding and recording apparatus for, when content key information corresponding to encoded content recorded in a content storage medium is input, encoding the content key information and recording it in a storage medium, the encoding and recording apparatus comprising:

first encoding means for encoding fixed information which are input in advance and different for each user, and for writing the obtained encoded fixed information in a protected area of the storage medium;

decoding means for obtaining fixed information by decoding the encoded fixed information in the protected area; and

second encoding means for encoding the content key information on the basis of the fixed information obtained by the decoding means or fixed information newly input, and for writing the obtained encoded content key information in a data area of the storage medium other than the protected area.

2. The encoding storage medium according to claim 1, wherein

the first encoding means execute the encoding with a medium identifier recorded in the storage medium being as a key.

4. The encoding and recording apparatus according to claim 1, comprising:

read/write means for maintaining the storage medium, and for executing reading/writing of information with respect to the storage medium.

5. The encoding and recording apparatus according to claim 1, comprising:

collation means for collating the fixed information obtained by the decoding means with the fixed information which are newly input and are different for each user, and for operating the second encoding means only when the both are coincident,with each other.

6. The encoding and recording apparatus according to claim 1, comprising:

third encoding means for encoding user attribute information input in advance, and for writing the obtained encoded user attribute information in a data area of the storage medium.

7. The encoding and recording apparatus according to claim 1, comprising

fourth encoding means for encoding content attribute information input in advance, and for writing the obtained encoded content attribute information in a data area of the storage medium.

8. The encoding and recording apparatus according to claim 1, wherein the second encoding means comprises:

a plurality of encoding units to encode content key information different from one another on the basis of the fixed information; and

a synthesis unit to synthesize a plurality of content key information obtained by the respective encoding units, and to write obtained encoded content key synthesis information, Enc_k in a data area of the storage medium.

3. An encoding and recording apparatus for, when content key information corresponding to encoded content recorded in a content storage medium is input, encoding the content key information and recording it in a storage medium, the encoding and recording apparatus comprising:

decoding means for, when encoded fixed information which is written in advance in a protected area of the storage medium and which is formed due to fixed information different for each user being encoded is read out of the protected area, obtaining fixed information by decoding the encoded fixed information; and

second encoding means for encoding the content key information on the basis of the fixed information obtained by the decoding means or fixed information newly input, and for writing the obtained encoded content key information in a data area of the storage medium other than the protected area.

9. A playback apparatus for decoding encoded content key information recorded in a content storage medium on the basis of encoded fixed information and encoded content key information which have been recorded in a key storage medium, and for outputting decoded results, the playback apparatus comprising:

first decoding means for decoding the encoded fixed information in the key storage medium to obtain fixed information;

second decoding means for decoding the encoded content key information in the key storage medium on the basis of the fixed information to obtain content key information;

third decoding means for decoding the encoded content key information in the content storage medium on the basis of the decoded content key information to obtain content key information; and

output processing means for processing to output the decoded content information.

10. The playback apparatus according to claim 9, wherein

the first decoding means executes the decoding with a medium identifier recorded in the storage medium being as a key.

11. The playback apparatus according to claim 10, comprising:

collation means for collating fixed information newly input with the decoded fixed information, and for correctly operating the output processing means only when the both are coincident with each other.

12. The playback apparatus according to claim 9, comprising:

collation means for collating fixed information newly input with the decoded fixed information, and for correctly operating the output processing means only when the both are coincident with each other.

13. The playback apparatus according to claim 9, comprising:

read means for, when the key storage medium and the content storage medium are same recording media, maintaining the same recording media, and executing reading of information with respect to the recording media.

14. The playback apparatus according to claim 9, comprising:

fourth decoding means for decoding encoded user attribute information recorded in advance in the key storage medium to obtain user attribute information, wherein

the output processing means comprises;

a first changing unit which changes content of the output processing on the basis of the decoded user attribute information.

15. The playback apparatus according to claim 9, comprising:

fifth decoding means for decoding encoded content attribute information recorded in advance in the key storage medium to obtain content attribute information, wherein

the output processing means comprises;

a second changing unit which changes content of the output processing on the basis of the decoded content attribute information.

16. The playback apparatus according to claim 9, wherein

the second decoding means has a plurality of key decoding units to decode content key information different from each other in the key storage medium on the basis of the decoded fixed information,

the third decoding means has a plurality of content decoding units to partially decode encoded content information, in the content storage medium on the basis of the respective content key information obtained by the respective key decoding units, and

the output processing unit executes the output processing on the basis of the respective content information obtained by the respective content decoding units.

17. A program stored in a computer readable storage medium, for use in an encoding and recording apparatus for encoding content key information to be input, and recording it in a recording media, the program comprising:

a first program code to cause a computer to execute a first encoding processing for encoding fixed information input in advance to be temporarily maintained in a memory, and for writing the maintained encoded fixed information in a protected area of the storage medium;

a second program code to cause making a computer to execute a decoding processing for decoding the encoded fixed information in the protected area and for obtaining fixed information; and

a third program code to cause a computer to execute a second encoding processing for encoding the content key information to be temporarily maintained in a memory on the basis of the decoded fixed information, and for writing the maintained encoded content key information in a data area of the storage medium other than the protected area.

18. The program according to claim 17, wherein

the first encoding processing causes a computer to realize a function of executing the encoding with a medium identifier recorded in the storage medium being as a key.

20. The program according to claim 17, comprising:

a fourth program code to cause a computer to execute a collation processing for collating the fixed information obtained by the decoding processing with the fixed information which are newly input and different for each user, and for executing the second encoding processing only when the both are coincident with each other.

21. The program according to claim 17, comprising:

a fifth program code to cause a computer to execute a third encoding processing for encoding user attribute information input in advance to be temporarily maintained in a memory, and for writing the maintained encoded user attribute information in a data area of the storage medium.

22. The program according to claim 17, comprising:

a sixth program code to cause a computer to execute a fourth encoding processing for encoding content attribute information input in advance to be temporarily maintained in a memory, and for writing the maintained encoded content attribute information in a data area of the storage medium.

23. The program according to claim 17, wherein

the second encoding processing includes:

a plurality of encoding processings for encoding C. content key information different from one another on the basis of the decoded fixed information; and

a synthesis processing for synthesizing a plurality of encoded content key information obtained by the respective encoding processings to be temporarily maintained in a memory, and for writing the maintained encoded content key synthesis information, Enc_k in a data area of the storage medium.

19. A program for use in an encoding and recording apparatus for when content key information corresponding to encoded content recorded in a content storage medium is input, encoding the content key information and recording it in a storage medium, the program comprising:

a first program code to cause a computer to execute a decoding processing for, when encoded fixed information which is written in advance in a protected area of the storage medium and is formed due to fixed information different for each user being encoded is read from the protected area, obtaining fixed information by decoding the encoded fixed information; and

a second program code to cause a computer to execute a second encoding processing for encoding the content key information to be temporarily maintained in a memory on the basis of the fixed information obtained by the decoding means or fixed information newly input, and for writing the maintained encoded content key information in a data area of the storage medium other than the protected area.

24. A program stored in a computer readable storage medium, for use in a playback apparatus for decoding encoded content key information recorded in a content storage medium on the basis of encoded fixed information and encoded content key information which have been recorded in a key storage medium, and for outputting decoded results, the program comprising:

a first program code to cause a computer to execute a first decoding processing for decoding the encoded fixed information in the key storage medium to be temporarily maintained in a memory, and for transmitting the maintained fixed information;

a second program code to cause a computer to execute a second decoding processing for decoding the encoded content key information in the key storage medium to be temporarily maintained in a memory on the basis of the transmitted fixed information, and for transmitting the maintained content key information;

a third program code to cause a computer to execute a third decoding processing for decoding the encoded content key information in the content storage medium to be temporarily maintained in a memory on the basis of the transmitted content key information, and for transmitting the maintained content information; and

a fourth program code to cause a computer to execute an output processing for the transmitted content information.

25. The program according to claim 24, wherein

the first decoding processing causes the computer to realize a function of executing the decoding with a medium identifier recorded in the storage medium being as a key.

26. The program according to claim 25, comprising:

a fifth program code to cause a computer to execute a collation processing for collating fixed information newly input with the decoded fixed information, and for correctly operating the output processing only when the both are coincident with each other.

27. The program according to claim 24, comprising:

a fifth program code to cause a computer to execute a collation processing for collating fixed information newly input with the decoded fixed information, and for correctly operating the output processing only when the both are coincident with each other.

28. The program according to claim 24, comprising:

a sixth program code to cause a computer to execute a fourth decoding processing for decoding encoded user attribute information recorded in advance in the key storage medium to be temporarily maintained in a memory, and for transmitting the maintained user attribute information, wherein

the output processing includes;

a first content changing processing for changing content of the output processing on the basis of the transmitted user attribute information.

29. The program according to claim 24, comprising:

a seventh program code to cause a computer to execute a fifth decoding processing for decoding. encoded content attribute information recorded in advance in the key storage medium to be temporarily maintained in a memory, and for transmitting the maintained content attribute information, wherein

the output processing includes;

a second content changing processing for changing content of the output processing on the basis of the transmitted content attribute information.

30. The program according to claim 24, wherein

the second decoding processing includes a plurality of key decoding processings for decoding content key information different from each other in the key storage medium on the basis of the decoded fixed information,

the third decoding processing includes a plurality of content decoding processings for partially decoding encoded content information in the content storage medium on the basis of respective content key information obtained by the respective key decoding procedures, and

the fourth program code for the output processing causes the computer to realize a function of executing the output processing on the basis of the respective content information obtained by the respective content decoding processings.

31. An encoding and recording apparatus for recording content key information formed due to content key information corresponding to encoded content recorded in a content storage medium being encoded, in a storage medium, the encoding and recording apparatus comprising:

first encoding means for, when fixed information different for each user is received from a network, encoding the fixed information, and writing the obtained encoded fixed information in a protected area of the storage medium; and

key writing means for, when encoded content key information which can be decoded by the fixed information is received from a network, writing the encoded content key information in a data area of the storage medium other than the protected area.

32. The encoding and recording apparatus according to claim 31, wherein

the first encoding means executes the encoding with a medium identifier recorded in the storage medium being as a key.

33. The encoding and recording apparatus according to claim 32, comprising

attribute information writing means for, when encoded attribute information, which can be decoded by the fixed information is received from the network, writing the encoded attribute information in a data area of the storage medium other than the protected area.

34. The encoding and recording apparatus according to claim 31, comprising

attribute information writing means for, when encoded attribute information, which can be decoded by the fixed information is received from the network, writing the encoded attribute information in a data area of the storage medium other than the protected area.

35. The encoding and recording apparatus according to claim 33, wherein

the encoded attribute information is encoded user attribute information formed due to user attribute information being encoded by the fixed information, and/or encoded content attribute information formed due to content attribute information being encoded by the fixed information.

36. A program stored in a computer readable storage medium, for use in an encoding and recording apparatus for recording content key information formed due to content key information corresponding to encoded content recorded in a content storage medium being encoded, in a storage medium, the program comprising:

a first program code to cause a computer to execute a first encoding processing for, when fixed information different for each user is received from a network, encoding the fixed information to be temporarily maintained in a memory, and writing the maintained encoded fixed information in a protected area of the storage medium; and

a second program code to cause a computer to execute key writing processing for, when encoded content key information which can be decoded by the fixed information is received from a network, writing the encoded content key information in a data area of the storage medium other than the protected area.

37. The program according to claim 36, wherein

the first encoding processing causes the computer to realize a function of executing the encoding with a medium identifier recorded in the storage medium being as a key.

38. The program according to claim 37, comprising:

a third program code to cause a computer to execute attribute information writing processing for, when encoded attribute information, which can be decoded by the fixed information is received from a network, writing the encoded attribute information in a data area of the storage medium other than the protected area.

39. The program according to claim 36, comprising:

a third program code to cause a computer to execute attribute information writing processing for, when encoded attribute information, which can be decoded by the fixed information is received from a network, writing the encoded attribute information in a data area of the storage medium other than the protected area.

40. The program according to claim 38, wherein

the encoded attribute information is encoded user attribute information formed due to user attribute information being encoded by the fixed information, and/or encoded content attribute information formed due to content attribute information being encoded by the fixed information.

41. A program stored in a computer readable storage medium, for use in a server apparatus which can communicate via a network with respect to an encoding and recording apparatus having a function of encoding fixed information to be input which are different for each user and recording it in a storage medium, and a function of recording encoded content key information which can be decoded by the fixed information in the storage medium, the program comprising:

a first program code to cause a computer to execute a fixed information transmitting processing for reading out the fixed information maintained in advance in a memory from the memory, and for transmitting the obtained fixed information to the encoding and recording apparatus via the network; and

a second program code to cause a computer to execute key encoding processing for encoding content key information input in advance on the basis of the fixed information in the memory, and for transmitting the obtained encoded content key information to the encoding and recording apparatus via the network.

42. A program according to claim 41, comprising

a third program code to cause a computer to execute an attribute information encoding processing for encoding user attribute information and/or content attribute information which are input in advance on the basis of the fixed information in the memory, and for transmitting the obtained encoded attribute information to the encoding and recording apparatus via the network.

43. The program according to claim 42, wherein

the key encoding processing includes:

a plurality of encoding processings for encoding content key information different from one another on the basis of the fixed information; and

a synthesis processing for synthesizing a plurality of encoded content key information obtained by the respective encoding processings, and for transmitting the obtained encoded content key synthesis information to the encoding and recording apparatus.

44. The program according to claim 41, wherein

the key encoding processing includes:

a plurality of encoding processings for encoding content key information different from one another on the basis of the fixed information; and

a synthesis processing for synthesizing a plurality of encoded content key information obtained by the respective encoding processings, and for transmitting the obtained encoded content key synthesis information to the encoding and recording apparatus.