System Renewability Message Transport via IP Stream
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Solution Overview
Problem
Current systems fail to efficiently distribute and process System Renewability Messages (SRMs) within digital content streams, leading to unauthorized use of protected content due to stolen or cloned devices, which are not effectively revoked by existing copy protection technologies.
Innovation Solution
The transmission of SRMs is integrated into an IP-type or MPEG-2 Systems transport stream, using XML-type files to identify unauthorized devices, preventing their use by incorporating SRM data into the transport stream's metadata, allowing receiving devices to authenticate and restrict access accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRMs are distributed separately from content streams, then device revocation can be implemented, but distribution efficiency and processing speed deteriorate
Solution Approach 1:
The patent merges SRM distribution with content stream delivery by embedding SRM data within the same transport stream that carries protected content. This allows receiving devices to obtain both content and revocation information simultaneously, eliminating separate distribution steps and improving overall system efficiency while maintaining reliable device revocation capability.
2Reliability
If SRM processing is performed in real-time, then unauthorized device detection improves, but processing complexity and computational load increase
Solution Approach 1:
The patent implements preliminary action by pre-processing and organizing SRM data in a structured format within the transport stream before content delivery. Receiving devices can efficiently search and compare device identifiers against pre-organized revocation lists, reducing real-time computational complexity while maintaining accurate unauthorized device detection.
3Adaptability or versatility
If multiple copy protection technologies are supported, then system versatility improves, but SRM management complexity increases
Solution Approach 1:
The patent implements universality by designing a unified transport stream framework that can carry SRM data for multiple copy protection technologies using standardized protocols. The system uses universal identifiers and structured data formats that allow a single receiving device to process revocation information from different protection systems without requiring separate management mechanisms for each technology.
Data Source
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AI summary
System renewability message data is transmitted to set top boxes, or other devices, using a transport protocol such as, for example, an Internet protocol-type data stream. In accordance with one embodiment, an Extensible Markup Language-type file is received via an Internet protocol-type transport stream. Data, which corresponds to the identities of devices that are unauthorized for the use of certain content, is selected from the Extensible Markup Language-type file. This data from the file is processed whereupon use of the content is prevented in accordance with the data.