# US 7,080,410 B2 · Protecting decrypted compressed content and decrypted decompressed content at a digital rights management client > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,080,410 B2 - Document ID: US7080410B2 - Status: Granted - Kind: B2 - Application number: 11/176,887 - Filed: 2005-07-07 - Published: 2005-12-08 - Granted: 2006-07-18 - Earliest claimed: 2001-06-27 - Assignees: Microsoft Corporation - Inventors: Paul England; Marcus Peinado; Mukund Sankaranarayan - Web page: https://patentgrep.com/patent/US7080410B2 ## CPC - 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]} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## 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 ### Claim 1 A method of preventing theft of decompressed digital content as the content is being rendered, the method comprising: detecting a re-compressor-based requested slow-down of the rendering of the content, wherein the detected requested slow-down is presumably initiated by a content thief attempting to steal and re-compress the content; and responding to the detected requested slow-down in a manner designed to frustrate the presumed attempt of the content thief to steal and re-compress the content, wherein detecting comprises sensing X consecutive SEEK or STEP operations. ### Claim 2 (depends on 1) The method of claim 1 wherein detecting comprises consulting all available clocks and determining therefrom if rendering is occurring at less than real-time speed. ### Claim 3 (depends on 1) The method of claim 1 wherein responding comprises ignoring control operations such as SEEK and STEP for Y seconds. ### Claim 4 (depends on 1) The method of claim 1 wherein responding comprises performing a non-responsive action. ### Claim 5 (depends on 4) The method of claim 4 wherein responding comprises performing a non-responsive action selected from a group consisting of rendering at real-time speed, intentionally omitting rendering of frames, and stopping rendering. ### Claim 6 (depends on 1) The method of claim 1 wherein responding comprises providing requested data with a built-in error. ### Claim 7 (depends on 6) The method of claim 6 wherein responding comprises providing requested data with a built-in error which becomes progressively worse. ### Claim 8 A method of preventing theft of decompressed digital content as the content is being rendered, the method comprising: detecting a re-compressor-based requested slow-down of the rendering of the content, wherein the detected requested slow-down is presumably initiated by a content thief attempting to steal and re-compress the content; and responding to the detected requested slow-down in a manner designed to frustrate the presumed attempt of the content thief to steal and re-compress the content, wherein responding comprises ignoring control operations such as SEEK and STEP for Y seconds. ### Claim 9 (depends on 8) The method of claim 8 wherein detecting comprises sensing X consecutive SEEK or STEP operations. ### Claim 10 (depends on 8) The method of claim 8 wherein detecting comprises consulting all available clocks and determining therefrom if rendering is occurring at less than real-time speed. ### Claim 11 (depends on 8) The method of claim 8 wherein responding comprises performing a non-responsive action. ### Claim 12 (depends on 11) The method of claim 11 wherein responding comprises performing a non-responsive action selected from a group consisting of rendering at real-time speed, intentionally omitting rendering of frames, and stopping rendering. ### Claim 13 (depends on 8) The method of claim 8 wherein responding comprises providing requested data with a built-in error. ### Claim 14 (depends on 13) The method of claim 13 wherein responding comprises providing requested data with a built-in error which becomes progressively worse. ### Claim 15 A method of preventing theft of decompressed digital content as the content is being rendered, the method comprising: detecting a re-compressor-based requested slow-down of the rendering of the content, wherein the detected requested slow-down is presumably initiated by a content thief attempting to steal and re-compress the content; and responding to the detected requested slow-down in a manner designed to frustrate the presumed attempt of the content thief to steal and re-compress the content, wherein responding comprises providing requested data with a built-in error which becomes progressively worse. ### Claim 16 (depends on 15) The method of claim 15 wherein detecting comprises sensing X consecutive SEEK or STEP operations. ### Claim 17 (depends on 15) The method of claim 15 wherein detecting comprises consulting all available clocks and determining therefrom if rendering is occurring at less than real-time speed. ### Claim 18 (depends on 15) The method of claim 15 wherein responding comprises ignoring control operations such as SEEK and STEP for Y seconds. ### Claim 19 (depends on 15) The method of claim 15 wherein responding comprises performing a non-responsive action. ### Claim 20 (depends on 19) The method of claim 19 wherein responding comprises performing a non-responsive action selected from a group consisting of rendering at real-time speed, intentionally omitting rendering of frames, and stopping rendering.