Asymmetrical Encryption Storage System Copyright Protection
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Solution Overview
Problem
Existing methods for copyright protection of digital entertainment content are vulnerable to reverse engineering, leading to unauthorized copying, necessitating a more robust security solution.
Innovation Solution
Implementing a system where digital content is encrypted with a private key based on a unique ID number associated with the data storage device, and only decryptable using a corresponding public key, ensuring that only the original device can access and decrypt the content, preventing unauthorized copying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If format-based copyright protection and application layer software are used, then copyright protection is provided, but the protection is vulnerable to reverse engineering
Solution Approach 1:
The patent replaces software-based copyright protection mechanisms with hardware-based encryption. Specifically, it uses a dedicated decryption device with a decryption key stored in hardware to convert encrypted digital content back to its original form. This hardware-based approach substitutes the vulnerable software layer with a more secure physical implementation, making reverse engineering significantly more difficult while maintaining the necessary functionality for content access.
Solution Approach 2:
The patent introduces a decryption device as an intermediary component between the encrypted content storage and the content playback system. This decryption device holds the decryption key in its memory and performs the actual decryption operation, acting as a secure mediator that prevents direct access to the encrypted content without proper authorization. The intermediary device effectively isolates the security-critical decryption key from the rest of the system, enhancing protection reliability.
2Ease of operation
If decryption key is stored in the data storage device, then content can be decrypted, but unauthorized copying becomes possible through reverse engineering
Solution Approach 1:
The patent segments the copyright protection system into distinct functional components: an encryption device that secures the content, a data storage device that holds the encrypted content, and a dedicated decryption device that contains the decryption key in its memory. This segmentation isolates the decryption key within a specialized device, preventing it from being easily accessed or copied from the general storage system. The key is stored in the decryption device's memory rather than in the data storage device, creating a security boundary that prevents unauthorized copying while maintaining decryption functionality.
3Reliability
If robust hardware-based encryption is implemented, then security against reverse engineering is improved, but system complexity increases
Solution Approach 1:
The decryption device is designed as a multi-functional component that combines content decryption, key management, and authorized playback initiation in a single device. This universal device handles multiple security-critical functions that would otherwise require separate components, thereby reducing overall system complexity while maintaining robust security. The decryption device can decrypt content, manage the decryption key securely in its memory, and initiate authorized playback, consolidating what could have been multiple separate functions into one integrated solution.
Data Source
AI summary
Robust security of copyright-protected content is provided when such content is digitally stored in a storage device of a client device in encrypted form. The copyright-protected content is encrypted by a server device using a private key and a corresponding public key is used for decryption by the client device. Because access to the private key cannot be determined from the corresponding public key, and because the private key and public key are based at least in part on a unique ID number embedded in the data storage device, decryption can only be performed by the data storage device in the client device. In some embodiments, robust security of private data stored in a server device is provided using a similar public-key/private-key pair and encryption scheme.