Multi-DRM Document Header Structure for Cross-Platform Compatibility
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Solution Overview
Problem
Existing digital rights management (DRM) systems are incompatible across different platforms, preventing content protected by one system from being viewed on devices that support another system without duplicating the content, as each system uses distinct headers for encryption.
Innovation Solution
A method to protect documents with multiple DRM systems by adding a second header associated with a different DRM scheme to the existing encrypted content, allowing the content to be playable/viewable on multiple platforms without duplicating the encrypted data, by using a server to manage and convert between DRM systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If content is protected by a single DRM system with its own encryption scheme and header, then the content security is maintained according to that specific DRM scheme, but the content cannot be viewed on devices that support different DRM systems
Solution Approach 1:
The patent embeds multiple DRM protection layers within a single content file. Each DRM system's encryption and header are nested together, allowing the content to be protected by multiple DRM schemes simultaneously. The structure contains inner DRM protections within an outer DRM framework, enabling players to access content through whichever DRM layer they support.
Solution Approach 2:
The content file is designed to serve multiple DRM systems universally. By incorporating multiple encryption schemes and headers from different DRM systems (e.g., OMA DRM, ISMA, Adobe DRM) into a single file, the content becomes universally compatible with players supporting any of these systems, eliminating the need for separate encrypted copies.
2Reliability
If multiple encrypted copies of the same content are created for different DRM systems, then each DRM system can protect the content according to its own scheme, but the content size increases due to duplication
Solution Approach 1:
The patent merges multiple DRM protection mechanisms into a single content file rather than maintaining separate encrypted copies. Multiple encryption schemes and their respective headers are combined within one file structure, reducing the total quantity of encrypted content from multiple separate files to a single unified file that provides equivalent protection across different DRM systems.
3Ease of operation
If a DRM-protected document is distributed to multiple computer platforms, then the content can be accessed on supported devices, but players must understand the specific DRM scheme used, which varies across platforms
Solution Approach 1:
The multi-DRM file structure acts as an intermediary between different DRM systems and players. By embedding multiple DRM layers, the file mediates compatibility issues, allowing players from different platforms (mobile phones, PDAs, personal computers) to access content through their supported DRM scheme without requiring the content to be converted or re-encrypted.
Data Source
AI summary
Techniques, systems, and apparatus, including medium-encoded computer program products, for protecting a document with multiple digital rights management systems are presented. A described technique includes encrypting content in accordance with a first digital rights management scheme using a key and an encryption scheme, generating a first header associated with the encrypted content in accordance with the first digital rights management scheme, generating a second header associated with the encrypted content in accordance with a second digital rights management scheme, and creating a protected document that includes the first header, the second header, and the encrypted content.