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

• US 7,162,745 B2
• Filed: 07/07/2005
• Issued: 01/09/2007
• Est. Priority Date: 06/27/2001
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: England, Paul, Peinado, Marcus, Sankaranarayan, Mukund
• Primary Examiner(s): Barrón, Jr.; Gilberto
• Assistant Examiner(s): Sandoval; Kristin D.
• Application Number:
  US11/176,080
• Publication Number:
  US 20050243999A1
• Time in Patent Office: 551 Days
• Field of Search: None
• US Class Current: 726/32
• 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. A method of preventing theft of decompressed digital content as the content is being rendered, the method comprising:

detecting transfers of amounts of data above a predetermined amount, 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,

wherein rendering of the content occurs on a processor having an amount of capacity, and wherein responding comprises reserving an amount of the capacity of the processor above a predetermined amount for rendering, the reserved capacity not being available to the content thief for use in stealing the content.

2. The method of claim 1 wherein responding comprises stopping rendering of the content.

3. The method of claim 1 wherein responding comprises slowing rendering of the content.

4. The method of claim 1 wherein responding comprises degrading rendering of the content.

8. The medium of claim 1 wherein the second module degrades rendering of the content.

5. 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 amounts of data above a predetermined amount, 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,

wherein rendering of the content occurs on a processor having an amount of capacity, and wherein the second module reserves an amount of the capacity of the processor above a predetermined amount for rendering, the reserved capacity not being available to the content thief for use in stealing the content.

6. The medium of claim 5 wherein the second module stops rendering of the content.

7. The medium of claim 5 wherein the second module slows rendering of the content.