Audiovisual Stream Distribution via Segmented DRM Complementary Information
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Solution Overview
Problem
Existing solutions for distributing audiovisual content through telecommunication networks or physical supports face challenges in interoperability between different Digital Rights Management (DRM) systems, leading to inefficiencies in content protection and transmission, as well as limitations in hardware and software architecture of devices like personal digital assistants and mobile phones.
Innovation Solution
A method and system that modify the audiovisual stream by generating complementary information and applying multiple DRM protection methods, allowing the stream to be reconstructed only with compatible access methods, thereby reducing the volume of data to be transmitted and enabling interoperability across various DRM systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire audiovisual stream is protected by DRM to ensure security, then content protection is improved, but the data transmission volume increases significantly
Solution Approach 1:
The audiovisual stream is segmented into two distinct parts: a main stream containing most of the content data, and complementary information containing only the essential protection elements. This segmentation allows DRM to be applied selectively to the smaller complementary information portion rather than the entire stream, thereby maintaining security while reducing transmission volume.
Solution Approach 2:
The protection-critical elements are extracted from the main audiovisual stream and placed into a separate complementary information structure. This extraction enables the main stream to be transmitted without DRM overhead, while the extracted complementary information receives the necessary protection, achieving both security and efficiency.
2Adaptability or versatility
If multiple DRM systems are implemented to ensure compatibility across different devices, then interoperability is improved, but device complexity increases
Solution Approach 1:
The complementary information structure is designed with universal compatibility in mind, using standardized formats and metadata that can be interpreted by multiple DRM systems. This multi-functional design allows a single complementary information package to work across different device types and DRM implementations without requiring each device to support multiple proprietary formats.
Solution Approach 2:
The complementary information acts as an intermediary layer between the main stream and various DRM systems. It contains standardized protection metadata that mediates between different DRM implementations, enabling interoperability without requiring direct integration between the main stream and multiple proprietary DRM systems.
3Reliability
If DRM is applied to the entire audiovisual stream, then security is improved, but transmission efficiency deteriorates
Solution Approach 1:
The stream is divided into main content and complementary protection information, allowing selective application of DRM only to the essential protective elements rather than the entire audiovisual data, thereby improving transmission efficiency while maintaining security.
Solution Approach 2:
Instead of applying DRM to the complete stream (excessive action), the solution applies DRM only to the minimal necessary complementary information (partial action), which is sufficient to protect the content while avoiding the performance penalty of protecting the entire stream.
Data Source
AI summary
A method for distributing a nominal audiovisual stream to a recipient device including modifying, in the nominal audiovisual stream, at least one nominal coefficient among the nominal coefficients to generate a modified main stream; generating complementary information such that the nominal audiovisual stream may be implemented based from the complementary information and on the modified main stream, applying a plurality of methods for protecting the complementary information to generate multiple protected complementary information, each of the protected complementary information enabling the nominal stream of the main stream to be implemented upon application of an access method compatible with the protection method which has been used to protect it; and transmitting to the recipient device the modified main stream and the multiple protected complementary information.