Protecting decrypted compressed content and decrypted decompressed content at a digital rights management client

• US 20050243999A1
• Filed: 07/07/2005
• Published: 11/03/2005
• Est. Priority Date: 06/27/2001
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: England, Paul, Peinado, Marcus, Sankaranarayan, Mukund
• Granted Patent: US 7,162,745 B2
• Time in Patent Office: Days
• US Class Current: 380/35
• 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

Theft of decompressed digital content as the content is being rendered is prevented. A requested slow-down of the rendering of the content is detected. Transfers of relatively large amounts of data are detected. A re-compressor-based requested slow-down of the rendering of the content is detected. A re-compressor re-compressing the content is detected. In each situation, the detected activity is presumably initiated by a content thief attempting to steal the content. In each situation, the detected activity is responded to in a manner designed to frustrate the presumed attempt of the content thief to steal the content.

Claims

1-9. -9. (canceled)

10. A method of preventing theft of decompressed digital content as the content is being rendered, the method comprising:

detecting transfers of relatively large amounts of data, wherein the detected transfers are presumably initiated by a content thief attempting to steal the content; and

responding to the detected transfers in a manner designed to frustrate the presumed attempt of the content thief to steal the content.

11. The method of claim 10 wherein responding comprises stopping rendering of the content.

12. The method of claim 10 wherein responding comprises slowing rendering of the content.

13. The method of claim 10 wherein responding comprises degrading rendering of the content.

14. The method of claim 10 wherein rendering of the content occurs on a processor having an amount of capacity, and wherein responding comprises reserving a relatively large amount of the capacity of the processor for rendering, the reserved capacity not being available to the content thief for use in stealing the content.

15-38. -38. (canceled)

39. A computer-readable medium having computer-executable instructions thereon for preventing theft of decompressed digital content as the content is being rendered, the instructions being organized into modules including:

a first module for detecting transfers of relatively large amounts of data, wherein the detected transfers are presumably initiated by a content thief attempting to steal the content; and

a second module for responding to the detected transfers in a manner designed to frustrate the presumed attempt of the content thief to steal the content.

40. The medium of claim 39 wherein the second module stops rendering of the content.

41. The medium of claim 39 wherein the second module slows rendering of the content.

42. The medium of claim 39 wherein the second module degrades rendering of the content.

43. The medium of claim 39 wherein rendering of the content occurs on a processor having an amount of capacity, and wherein the second module reserves a relatively large amount of the capacity of the processor for rendering, the reserved capacity not being available to the content thief for use in stealing the content.

44-58. -58. (canceled)