Distributed digital rights management system and method

• US 8,646,046 B2
• Filed: 05/15/2008
• Issued: 02/04/2014
• Est. Priority Date: 05/15/2008
• Status: Active Grant

• Current Assignee: Advanced Micro Devices, Inc., ATI Technologies ULC (Advanced Micro Devices, Inc.)
• Original Assignee: Advanced Micro Devices, Inc., ATI Technologies ULC (Advanced Micro Devices, Inc.)
• Inventors: Dos Remedios, Alwyn, Scherer, Stefan, Bapst, Mark, Patne, Satyajit
• Primary Examiner(s): Mehedi, Morshed
• Application Number:
  US12/121,558
• Publication Number:
  US 20090288137A1
• Time in Patent Office: 2,091 Days
• Field of Search: 726/4, 726/26
• US Class Current: 726/4
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• 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]

Abstract

A digital rights management system includes an authentication module and a decryption module. If desired, the modules can be implemented in separate integrated circuits. The authentication module retrieves authentication information for protected content and powers down after the authentication information is retrieved. The decryption module decrypts the protected content based on the authentication information while the authentication module is powered down.

Claims

1. A digital rights management system, comprising:

an authentication module that is operative to retrieve authentication information for protected content and to reduce power after the authentication information is retrieved,

the authentication module further operative to store the authentication information in memory prior to reducing power, the memory being powered independently of the authentication module; and

a decryption module that is operative to receive and decrypt the protected content based on the authentication information, the decryption module being operative to receive and decrypt the protected content while power of the authentication module is reduced.

2. The digital rights management system of claim 1 wherein the decryption module is operative to retrieve the authentication information from the memory.

3. The digital rights management system of claim 1 further comprising a media module that is operative to provide media output information based on the protected content.

4. The digital rights management system of claim 1 further comprising a power management module that is operative to selectively power up and reduce power of the authentication module.

5. The digital rights management system of claim 4 wherein the power management module is operative to power up the authentication module in response to an authentication request from the decryption module.

6. The digital lights management system of claim 4 wherein the power management module is operative to reduce power of the authentication module when the decryption module is decrypting the protected content.

7. The digital rights management system of claim 1 further comprising a communication module that is operative to transmit a request for the authentication information and to receive the authentication information in response to the request.

8. The digital rights management system of claim 7 wherein the communication module is operative to reduce power after receiving the authentication information.

9. A device comprising the digital rights management system of claim 1.

20. The system of claim 1, wherein the memory is accessible by the decryption module without involvement of the authentication module.

10. A digital rights management method, comprising:

retrieving, with an authentication module, authentication information for a protected content;

storing the authentication information in memory that is powered independently of the authentication module;

reducing power of the authentication module after the authentication information is retrieved; and

providing the authentication information to a decryption module while power of the authentication module is reduced;

decrypting the protected content based on the authentication information while power to the authentication module is reduced.

11. The digital rights management method of claim 10 further comprising:

retrieving the stored authentication information prior to decrypting the protected content; and

providing media output information based on the protected content.

12. The digital rights management method of claim 10 further comprising selectively powering up and reducing power of the authentication module.

13. The digital rights management method of claim 12 further comprising:

powering up the authentication module in response to an authentication request; and

reducing power of the authentication module when the decryption module is decrypting the protected content.

14. A device, comprising:

a first circuit that comprises;

an authentication module that is operative to retrieve authentication information for a protected content and to reduce power after the authentication information is retrieved;

a memory;

a power management module that is operative to selectively power up and reduce power to the authentication module independently of the memory, the authentication module being operative to store the authentication information in the memory prior to reducing power; and

a communication module that is operative to wirelessly transmit a request for the authentication information and to wirelessly receive the authentication in response to the request; and

a second circuit that comprises;

a decryption module that is operative to both retrieve the authentication information and decrypt the protected content based on the authentication information while power of the first circuit is reduced; and

a media module that is operative to provide media output information based on the protected content.

15. The device of claim 14 wherein the decryption module is operative to retrieve the authentication information from the memory.

16. The device of claim 14 wherein the power management module is operative to power up the authentication module in response to an authentication request from the decryption module and to reduce power of the authentication module when the decryption module is decrypting the protected content.

17. The device of claim 14 further comprising at least one of:

a display that is operative to provide an image based on the media output information; and

a speaker that is operative to provide audio based on the media output information.

18. The device of claim 14 wherein the communication module is powered up while power of the authentication module is reduced.

19. A method of managing digital rights content, comprising:

retrieving, with an authentication module, authentication information for protected content;

storing the authentication information in memory that is powered independently of the authentication module;

reducing power of the authentication module after the authentication information is retrieved;

providing the authentication information to a decryption module while power of the authentication module is reduced, and

decrypting the protected content based on the authentication information while power of the authentication module is reduced.