Methods for linking content with license

• US 20080112562A1
• Filed: 11/14/2006
• Published: 05/15/2008
• Est. Priority Date: 11/14/2006
• Status: Abandoned Application

• Current Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Original Assignee: SanDisk Technologies LLC (Western Digital Corporation)
• Inventors: Jogand-Coulomb, Fabrice, Tanik, Haluk Kent, Rasizade, Oktay
• Application Number:
  US11/599,655
• Publication Number:
  US 20080112562A1
• Time in Patent Office: Days
• US Class Current: 380/44
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/0844 with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys

Abstract

A method for accessing content is provided. In this method, a first parameter associated with a license is retrieved. The license is associated with the content. A second parameter associated with the content also is retrieved. With the first and second parameters, a third parameter based on the first and second parameters is generated. The third parameter is configured for use in decrypting the content and the content can be accessed based on the third parameter.

Claims

1. A method for accessing content, comprising:

retrieving a first parameter associated with a license, the license being associated with the content;

retrieving a second parameter associated with the content;

generating a third parameter based on the first and second parameters; and

accessing the content based on the third parameter, the third parameter being configured for use in decrypting the content.

2. The method of claim 1, wherein the accessing the content comprises:

transmitting the third parameter and a request for the content; and

receiving the content.

3. The method of claim 1, further comprising:

encrypting the third parameter based on a variable to define a session ticket, the variable being configured to change at a session; and

accessing the content based on the session ticket.

4. The method of claim 3, wherein the variable is configured to change randomly at the session.

5. The method of claim 1, wherein the license and the content are stored in a memory device.

6. The method of claim 1, wherein the first parameter is a number.

7. The method of claim 6, wherein the number is randomly generated.

8. The method of claim 1, wherein the second parameter is derived from a reference to a cryptographic key and the first parameter.

9. The method of claim 1, wherein the second parameter is derived from an authentication key and the first parameter.

10. The method of claim 1, wherein the second parameter is derived from a cryptographic nonce and the first parameter.

11. The method of claim 1, wherein the third parameter is a reference to a cryptographic key.

12. The method of claim 1, wherein the third parameter is an authentication key.

13. The method of claim 1, wherein the third parameter is a cryptographic nonce, the cryptographic nonce being used to generate a cryptographic key.

14. A computer program product embodied in a computer readable medium and comprising computer instructions for:

retrieving a first parameter from a license, the license being associated with a content,

retrieving a second parameter from the content;

generating a reference to a cryptographic key based on the first and second parameters; and

accessing the content based on the reference to the cryptographic key.

15. The computer program product of claim 14, wherein the computer instructions for accessing the content comprises:

transmitting the reference to the cryptographic key and a request for the content to a memory device; and

receiving the content from the memory device, the content being decrypted using the cryptographic key.

16. The computer program product of claim 14, wherein the license and the content are stored in a memory device.

17. The computer program product of claim 14, wherein the first parameter is derived from the reference to the cryptographic key and the second parameter.

18. The computer program product of claim 14, wherein the second parameter is a number that is randomly generated.

19. A method for accessing content stored in a memory device, comprising:

retrieving a first number from a license, the license being associated with the content, the first number being randomly generated;

retrieving a parameter from the content, the parameter being derived from a reference to a cryptographic key and the first number;

generating the reference to the cryptographic key based on the first number and the parameter; and

accessing the content based on the reference to the cryptographic key.

20. The method of claim 19, further comprising:

generating a session ticket based on the reference and a second number, the second number being configured to change at a session; and

accessing the content based on the session ticket.

21. The method of claim 19, wherein the content is encrypted using the cryptographic key.

22. The method of claim 19, wherein the parameter is located in a header of the content.

23. The method of claim 19, wherein the license is stored in the memory device.

24. The method of claim 23, wherein the license is located in a hidden partition of the memory device.