Device for protecting digital content, device for processing protected digital content, method for protecting digital content, method for processing protected digital content, storage medium storing program for protecting digital content, and storage medium storing program for processing protected digital content

• US 20060288424A1
• Filed: 10/26/2005
• Published: 12/21/2006
• Est. Priority Date: 06/01/2005
• Status: Active Grant

• Current Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Saito, Kazuo
• Granted Patent: US 8,549,606 B2
• Time in Patent Office: Days
• US Class Current: 726/26
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/2541 Rights Management protecting software against unauthorised usage in a vending or licensing environment G06F21/10; security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/25875 involving end-user authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 21/8355 involving usage data, e.g. number of copies or viewings allowed
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

There is provided a device for protecting a digital content. The device includes a digital content processing section that causes a digital content to be protected using security information; and an encrypting section that encrypts the security information, using a key acquired from a Digital Right Management system of an electronic ticket system.

Claims

1. A device for protecting a digital content, comprising:

a digital content processing section that causes a digital content to be protected using security information; and

an encrypting section that encrypts the security information, using a key acquired from a Digital Right Management system of an electronic ticket system.

2. The device according to claim 1, wherein the digital content processing section causes application software having a digital content protecting function to protect the digital content.

3. The device according to claim 2, further comprising

a password producing section that produces a password used for protection of the digital content by the application software, wherein

the application software is caused to protect the digital content using the password, and

the encrypting section encrypts the password as the security information.

4. The device according to claim 3, wherein the encrypted information is added to the digital content as property information.

5. The device according to claim 1, wherein the digital content processing section causes a lower level Digital Right Management system which is different from the Digital Right Management system to protect the digital content.

6. The device according claim 5, further comprising

a user authentication information generating section that generates user authentication information for the lower level Digital Right Management system, and

a section that sets right regarding the protected digital content in the lower level Digital Right Management system using the user authentication information, wherein

the encrypting section encrypts the user authentication information as the security information.

7. The device according to claim 5, wherein

the encrypting section encrypts identifying information to specify a key to open the protected digital content, and

the digital content processing section adds the information of the encrypted identifying information to the protected digital content.

8. The device according to claim 5, further comprising

a ticket acquiring section that acquires an electronic ticket to decrypt the security information from the lower level Digital Right Management system, wherein

the encrypting section encrypts the electronic ticket for the protected digital content as the security information.

9. The device according to claim 1, wherein information of right granted to a user regarding the protected digital content is encrypted together with the security information.

10. The device according to claim 1, wherein the protected digital content and the encrypted security information are combined to generate data to be distributed to a user.

11. A device for processing data including protected digital content and security information which protect the digital content, the security information is encrypted, comprising:

an information obtaining section that obtains the encrypted security information;

an electronic ticket acquiring section that acquires an electronic ticket to decrypt the encrypted security information from a Digital Right Management system;

a decrypting section that decrypts the encrypted information using the electronic ticket to obtain the security information; and

a processing section that processes the digital content using the decoded security information.

12. The device according to claim 11, wherein the digital content is protected by application software having a digital content protecting function.

13. The device according to claim 12, wherein the security information is a password used for protection of the digital content by the application software.

14. The device according to claim 13, wherein

the security information is added to the protected digital content as property information,

an information obtaining section obtains the encrypted security information from the property information of the protected digital content, and the decrypting section decrypts the encrypted information using the electronic ticket.

15. The device according to claim 11, wherein

the digital content is protected by a lower level Digital Right Management system which is different from the Digital Right Management system.

16. The device according to claim 15, wherein

the security information is user authentication information for the lower level Digital Right Management system,

the decrypting section decrypts the encrypted user authentication information using the electronic ticket and sends the decrypted user authentication information to the lower level Digital Right Management system, and

when the user authentication is succeeded, the processing section processes the digital content according to the authentication.

17. The device according to claim 15, wherein

the security information is a key identifier to specify a second electronic ticket to open the protected digital content, and the processing section obtains the key identifier as the decoded security information, acquires the second electronic ticket from the lower Digital Right Management system using the key identifier, and opens the protected digital content using the second electronic ticket.

18. The device according to claim 15, wherein

the security information is a second electronic ticket of the lower Digital Right Management system to open the protected digital content, and

the processing section obtains the second electronic ticket as the decoded security information, and opens the protected digital content using the second electronic ticket.

19. The device according to claim 11, wherein

the encrypted information includes information of right granted to a user regarding the protected digital content, and

what the user can do to the content is based on the information of the right.

20. A method for protecting digital content, comprising:

causing a digital content to be protected using security information, and

encrypting the security information, using a key acquired from a Digital Right Management system of an electronic ticket system.

21. The method according to claim 20, wherein

the digital content is protected by application software having a digital content protecting function.

22. The method according to claim 21, further comprising

producing a password used for protection of the digital content by the application software, wherein

the application software is caused to protect the digital content using the password, and

the password is encrypted as the security information.

23. The method according to claim 22, wherein

the encrypted security information is added to the digital content as property information.

24. The method according to claim 20, wherein the digital content is protected by a lower level Digital Right Management system which is different from the Digital Right Management system.

25. The method according claim 24, further comprising:

generating user authentication information for the lower level Digital Right Management system;

setting right regarding the protected digital content in the lower level Digital Right Management system using the user authentication information; and

encrypting the user authentication information as the security information.

26. The method according to claim 24, further comprising:

encrypting identifying information to specify a key to open the protected digital content; and

adding the encrypted identifying information to the protected digital content.

27. The method according to claim 24, further comprising:

acquiring an electronic ticket to decrypt the security information from the lower level Digital Right Management system; and

encrypting the electronic ticket for the protected digital content as the security information.

28. The method according to claim 20, wherein information of right granted to a user regarding the protected digital content is encrypted together with the security information.

29. The method according to claim 20, wherein the protected digital content and the encrypted security information are combined to generate data to be distributed to a user.

30. A method for processing data including protected digital content and security information which protect the digital content, the security information is encrypted, comprising:

obtaining the encrypted security information;

acquiring an electronic ticket to decrypt the encrypted security information from a Digital Right Management system;

decrypting the encrypted information using the electronic ticket to obtain the security information; and

processing the digital content using the decoded security information.

31. The method according to claim 30, wherein the digital content is protected by application software having a digital content protecting function.

32. The method according to claim 30, wherein the security information is a password used for protection of the digital content by the application software.

33. The method according to claim 32, wherein

the security information is added to the protected digital content as property information;

and the method further comprising;

obtaining the encrypted security information from the property information of the protected digital content; and

decrypting the encrypted information using the electronic ticket.

34. The method according to claim 30, wherein

the digital content is protected by a lower level Digital Right Management system which is different from the Digital Right Management system.

35. The method according to claim 34, wherein

the security information is user authentication information for the lower level Digital Right Management system, the method further comprising:

decrypting the encrypted user authentication information using the electronic ticket,

sending the user authentication information to the lower level Digital Right Management system, and

when the user authentication is succeeded, processing the digital content according to the authentication.

36. The method according to claim 34, wherein

the security information is a key identifier to specify a second electronic ticket to open the protected digital content, and the method further comprising:

obtaining the key identifier as the decoded security information,

acquiring the second electronic ticket from the lower Digital Right Management system using the key identifier, and

opening the protected digital content using the second electronic ticket.

37. The method according to claim 34, wherein

the security information is a second electronic ticket of the lower Digital Right Management system to open the protected digital content, and the method further comprising:

obtaining the second electronic ticket as the decoded security information, and

opening the protected digital content using the second electronic ticket.

38. The method according to claim 30, wherein

the encrypted information includes information of right granted to a user regarding the protected digital content, and

what the user can do to the content is based on the information of the right.

39. A storage medium readable by a computer, the storage medium storing a program of instructions executable by the computer to cause the computer to perform a function, the function comprising:

causing a digital content to be protected using security information, and

encrypting the security information, using a key acquired from a Digital Right Management system of an electronic ticket system.

40. The storage medium according to claim 39, wherein

the digital content is protected by application software having a digital content protecting function.

41. The storage medium according to claim 40, the function further comprising:

producing a password used for protection of the digital content by the application software;

wherein

the application software is caused to protect the digital content using the password, and

the password is encrypted as the security information.

42. The storage medium according to claim 41, wherein the encrypted security information is added to the digital content as property information.

43. The storage medium according to claim 39, wherein the digital content is protected by a lower level Digital Right Management system which is different from the Digital Right Management system.

44. The storage medium according claim 43, the function further comprising:

generating user authentication information for the lower level Digital Right Management system;

setting right regarding the protected digital content in the lower level Digital Right Management system using the user authentication information; and

encrypting the user authentication information as the security information.

45. The storage medium according to claim 43, the function further comprising:

encrypting identifying information to specify a key to open the protected digital content; and

adding the encrypted identifying information to the protected digital content.

46. The storage medium according to claim 43, the function further comprising:

acquiring an electronic ticket to decrypt the security information from the lower level Digital Right Management system; and

encrypting the electronic ticket for the protected digital content as the security information.

47. The storage medium according to claim 39, wherein information of right granted to a user regarding the protected digital content is encrypted together with the security information.

48. The storage medium according to claim 39, wherein the protected digital content and the encrypted security information are combined to generate data to be distributed to a user.

49. A storage medium for processing data including protected digital content and security information which protect the digital content, the security information is encrypted, comprising:

obtaining the encrypted security information;

acquiring an electronic ticket to decrypt the encrypted security information from a Digital Right Management system;

decrypting the encrypted information using the electronic ticket to obtain the security information; and

processing the digital content using the decoded security information.

50. The storage medium according to claim 49, wherein the digital content is protected by application software having a digital content protecting function.

51. The storage medium according to claim 49, wherein the security information is a password used for protection of the digital content by the application software.

52. The storage medium according to claim 51, wherein the security information is added to the protected digital content as property information;

and the function further comprising;

obtaining the encrypted security information from the property information of the protected digital content; and

decrypting the encrypted information using the electronic ticket.

53. The storage medium according to claim 49, wherein

the digital content is protected by a lower level Digital Right Management system which is different from the Digital Right Management system.

54. The storage medium according to claim 53, wherein

the security information is user authentication information for the lower level Digital Right Management system, the function further comprising:

decrypting the encrypted user authentication information using the electronic ticket,

sending the user authentication information to the lower level Digital Right Management system, and

when the user authentication is succeeded, processing the digital content according to the authentication.

55. The storage medium according to claim 53, wherein

the security information is a key identifier to specify a second electronic ticket to open the protected digital content, and the function further comprising:

obtaining the key identifier as the decoded security information,

acquiring the second electronic ticket from the lower Digital Right Management system using the key identifier, and opening the protected digital content using the second electronic ticket.

56. The storage medium according to claim 53, wherein

the security information is a second electronic ticket of the lower Digital Right Management system to open the protected digital content, and the function further comprising:

obtaining the second electronic ticket as the decoded security information, and

opening the protected digital content using the second electronic ticket.

57. The storage medium according to claim 49, wherein

the encrypted information includes information of right granted to a user regarding the protected digital content, and

what the user can do to the content is based on the information of the right.