Audiovisual Marking via Dual Stream Segmentation
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Solution Overview
Problem
Current methods for protecting audiovisual sequences against piracy during broadcasting are ineffective as they cannot provide personalized marking, allowing malicious users to access and misuse the content, and existing solutions face physical limitations and security vulnerabilities.
Innovation Solution
A process that generates a modified stream and a complementary stream, where the complementary data is calculated based on marking positions, allowing a receiver equipment to generate a second mark and reconstitute the audiovisual sequence, ensuring personalized marking and protection by embedding a first mark and altering visual content with dummy data, making it impossible for users to access the original sequence without authorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first mark is generated and applied to the initial content at marking positions, then the audiovisual sequence can be identified as pirated, but a fraudster can still recover the sequence at the exit of the decryption module before the watermarking module
Solution Approach 1:
The patent divides the protection process into two independent parts: a first mark applied to the nominal content and a second mark applied to the modified content. This segmentation ensures that both marks must be present for legitimate playback, making it impossible for fraudsters to recover the original content by intercepting only one stream.
Solution Approach 2:
The patent embeds multiple layers of protection within each other: the first mark is nested in the nominal content, the second mark is nested in the modified content, and the complementary data is nested within the transmission system. This nested structure ensures that the marks are applied at different levels of the content hierarchy, preventing circumvention.
2Adaptability or versatility
If identical marking instructions are transmitted to all receivers in broadcasting, then the distribution process is simple, but it is not possible to distinguish pirate copies
Solution Approach 1:
The patent applies different marks to different content streams based on their specific characteristics. The first mark is applied to the nominal content while the second mark is applied to the modified content, creating local differentiation that enables identification of pirate copies even in broadcasting scenarios.
Solution Approach 2:
The patent introduces dynamic marking where the marks are not static but can be generated and applied at different stages of content delivery. The first mark is applied at the content generation stage while the second mark is applied at the distribution stage, allowing the system to adapt to different delivery scenarios.
3Reliability
If the modified stream and complementary stream are transmitted, then the audiovisual sequence can be reconstituted with personalized marks, but the system becomes more complex
Solution Approach 1:
The patent performs preliminary actions by pre-generating the first mark and applying it to the nominal content before distribution. The complementary data is also prepared in advance, allowing the receiver to efficiently reconstruct the modified content with the second mark without requiring complex real-time processing.
Solution Approach 2:
The patent introduces complementary data as an intermediary element that facilitates the reconstruction process. This intermediary contains the necessary information to transform the modified stream into the final marked content, simplifying the receiver's processing requirements while maintaining security.
Data Source
AI summary
A process for distributing a marked audiovisual sequence from a nominal audiovisual sequence towards a receiver, said nominal audiovisual sequence having a nominal content, comprising: generating a marked audiovisual sequence according to a first mark applied to initial content at marking positions; generating a modified stream having a modified content different from the nominal content at least at marking positions; generating a complementary stream so that it is possible to reconstitute the marked audiovisual sequence from the modified stream; and transmitting the modified stream and the complementary stream towards the receiver wherein, on the receiver, a reconstitution of the audiovisual sequence, comprises calculating new complementary data according to the marking positions and the complementary stream so that it is possible to create an audiovisual sequence marked with a second mark from the modified stream, wherein the second mark, being different from the first mark, is applied to the initial content at the marking position.