Satellite Receiver Control Word Delay for Piracy Detection
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Solution Overview
Problem
Piracy of direct broadcast satellite signals remains a challenge due to sophisticated schemes involving unauthorized access and rebroadcast of control words, which existing technologies struggle to detect and prevent effectively.
Innovation Solution
Implementing a system that selectively delays the delivery of control words in a satellite receiver, causing temporary glitches in video playback, allowing identification of pirate devices by correlating glitch timings with specific bits of the security device's identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control words are delivered immediately to enable content decryption, then service availability is improved, but piracy detection capability deteriorates
Solution Approach 1:
The system performs preliminary action by delaying control word delivery intentionally to create detectable glitches before normal delivery resumes. This preliminary delay allows the system to embed identification markers in the pirated signal stream without permanently affecting service availability.
Solution Approach 2:
The system converts the harmful effect of control word delivery (which pirates exploit) into a beneficial detection mechanism. By deliberately causing temporary service disruption (glitches), the system creates unique identifiers that help detect and trace piracy sources, turning a vulnerability into a security feature.
2Difficulty of detecting and measuring
If control word delivery is delayed to detect piracy, then piracy detection capability is improved, but service availability deteriorates
Solution Approach 1:
The system applies periodic action by implementing intermittent, scheduled delays in control word delivery rather than continuous delays. Control words are delivered normally most of the time, with periodic deliberate delays inserted at specific intervals to create detectable glitches for piracy identification, thus maintaining high service availability while enabling detection.
Solution Approach 2:
The system uses partial action by applying delays only to specific control words or during specific time intervals rather than continuously delaying all control words. This partial delay approach creates sufficient glitches for piracy detection while minimizing the overall impact on service availability and user experience.
3Measurement precision
If frequent glitches are introduced to identify pirates, then measurement precision is improved, but user experience deteriorates
Solution Approach 1:
The system applies partial action by introducing glitches only occasionally and selectively rather than frequently and continuously. This allows sufficient precision in pirate identification through correlation analysis while keeping the negative impact on user experience minimal and acceptable.
Data Source
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AI summary
Systems, devices and automated processes detect piracy of broadcast television signals through selective delay of decrypted code words that are used to render satellite or other received television signals. Smart cards or similar access control hardware are programmed to selectively delay delivery of cryptographic code words based upon the identity of the receiver device. The delayed delivery of the code words produces intentional glitches in the content rendered by the receiver, thereby allowing viewers of the rendered content to ascertain the identity of the device.