Audiovisual Stream Segmentation for Secure Format-Conformant Distribution
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Solution Overview
Problem
Existing digital video stream protection methods either apply protection during encoding, leading to format preservation issues, or decompose streams into blocks for encryption, failing to ensure conformity with the original standard, and lack effective separation into secure and insecure parts.
Innovation Solution
A process that analyzes the original audiovisual stream to generate a modified main stream and complementary information, where the main stream contains the majority of the data and the complementary information is a small, essential part for reconstitution, using pseudorandom processes to protect the content while maintaining compatibility with the original format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the digital video stream is encrypted during encoding to protect content, then security is improved, but the stream may no longer conform to the original standard format
Solution Approach 1:
The patent divides the video stream into two separate parts: a first part containing the actual video data and a second part containing encryption keys and control information. This segmentation allows the video stream to maintain its original standard format for compatibility while the separate encryption components provide security without compromising format conformity.
2Adaptability or versatility
If the video stream is decomposed into blocks for independent encryption, then encryption flexibility is improved, but the ability to maintain original stream format is worsened
Solution Approach 1:
Instead of decomposing the video stream into blocks for encryption, the patent segments the stream into two distinct parts: the video data part and the encryption control part. This allows the video stream to maintain its original continuous format while encryption flexibility is achieved through the separate control information that can be independently managed.
3Reliability
If pseudorandom processes are applied to protect stream data, then security is improved, but the complexity of the system increases
Solution Approach 1:
The patent extracts the pseudorandom generation and encryption functions from the main video stream processing. By separating these security functions into a distinct second part containing keys and control information, the system achieves high security through pseudorandom processes while reducing the complexity of the main video stream handling and transmission.
Data Source
AI summary
A process for distributing audiovisual sequences may involve generating a modified main stream from an audiovisual sequence as well as complementary information that may enable equipment receiving the modified main stream and the complementary information to synthesize the audiovisual sequence. The modified main stream and the complementary information may be separately transmitted to the equipment.