Multimedia Frame Encryption for Copyright Protection
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Solution Overview
Problem
Existing multimedia file protection technologies are inadequate in preventing unauthorized access and playback of copyrighted digital multimedia information, as users with permission can distribute high-quality files, allowing others to access them without permission.
Innovation Solution
A method and device for processing multimedia files that involve acquiring payload data, selecting and encrypting frame data based on a pre-set strategy, and encoding it with an encryption identifier, allowing only authorized users to decrypt and play the files by using a matching decryption algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional user permission control is implemented to limit access to multimedia files, then copyright protection is improved to some extent, but authorized users can still distribute high-quality files to unauthorized users, resulting in inadequate protection
Solution Approach 1:
The multimedia file is segmented into multiple frames, and encryption is applied selectively to specific frames rather than the entire file. This segmentation allows the system to protect critical frames while permitting limited access to unencrypted frames, creating a layered protection mechanism that prevents complete file distribution by unauthorized users
Solution Approach 2:
Different encryption strategies are applied to different frames based on their importance. Critical frames containing essential information are encrypted, while less critical frames remain unencrypted or use weaker encryption. This local differentiation ensures that even if unauthorized users obtain some frames, they cannot reconstruct the complete high-quality file
2Reliability
If selective frame encryption is applied to protect copyright, then unauthorized access to high-quality files is prevented, but the system complexity increases due to encryption strategy management
Solution Approach 1:
Encryption strategies are pre-configured and embedded into the multimedia file structure during the encoding phase. The system performs preliminary encryption of selected frames based on predetermined criteria, eliminating the need for complex real-time decision-making during playback. This advance preparation simplifies the overall system architecture while maintaining robust protection
Solution Approach 2:
The patent uses cryptographic copying mechanisms where encrypted frames serve as protected copies that require specific decryption keys. The encryption system creates multiple versions of critical data with different protection levels, allowing the same content to be accessed differently by authorized and unauthorized users without requiring complex management logic
3Reliability
If all frame data is encrypted to prevent piracy, then copyright protection is maximized, but playback performance and user experience deteriorate due to decryption overhead
Solution Approach 1:
Instead of encrypting all frames, the system applies encryption only to a selective subset of frames that are most critical for copyright protection. This partial encryption approach significantly reduces the decryption overhead during playback while maintaining adequate protection, as unauthorized users cannot obtain the complete set of encrypted frames needed to reconstruct the full-quality file
Solution Approach 2:
The patent employs lightweight encryption algorithms that provide sufficient protection with minimal computational overhead. The encryption design prioritizes speed and efficiency, using simpler cryptographic operations that can be performed quickly during playback without significantly impacting performance, while still providing adequate protection against casual piracy
Data Source
AI summary
A method and a device for processing a multimedia file are provided. In some embodiments, for a multimedia file to be processed, payload data in the multimedia file is acquired, and the payload data includes multi-frame data forming the multimedia file. Some pieces of frame data are selected from the payload data as frame data to be encrypted, and the frame data to be encrypted is encrypted. New payload data is formed by the encrypted frame data and unencrypted frame data, and the new payload data is encoded to obtain an encoded multimedia file. Therefore, the protection of the copyrights of the multimedia file is achieved.