Persistent Two-Way Drive Authentication for Optical Disc Watermarking
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Solution Overview
Problem
Current watermark systems for content protection in disc drives and players are ineffective due to limitations in two-way drive authentication, which allows unauthorized access once the session ends, and users can bypass detection systems by changing default players, nullifying the protection.
Innovation Solution
Implementing Persistent Two-way Drive Authentication (P2DA) that locks the licensed drive to the licensed player until system reset, ensuring continuous authentication and preventing unauthorized access, while allowing temporary unlocking for unprotected discs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-way drive authentication is implemented to prevent unauthorized access, then content protection is improved, but the protection is nullified once the session ends or users change default players
Solution Approach 1:
The system performs preliminary authentication actions by establishing a persistent lock between the licensed drive and player before content playback begins. This lock remains in place before, during, and after the playback session, preventing unauthorized access attempts even when no content is actively being played. The authentication is not limited to the playback session but extends beyond it, ensuring continuous protection.
2Reliability
If the drive is locked to the licensed player to prevent unauthorized playback, then content security is improved, but access to unprotected discs and data discs is restricted
Solution Approach 1:
The authentication lock is applied selectively rather than universally. The licensed drive maintains a persistent lock with the licensed player for content-protected discs, but this lock can be temporarily suspended or modified when unprotected discs or data discs are detected. This allows the system to provide strong security for protected content while maintaining flexibility and usability for unprotected media types.
Solution Approach 2:
The authentication lock state is dynamic rather than static. The system can transition between locked and unlocked states based on the type of disc inserted and the current playback context. The persistent lock provides continuous protection for protected content, but the system can temporarily relax the lock when handling unprotected discs, thereby adapting to different operational requirements.
3Reliability
If watermark detection is performed in real-time to control playback, then unauthorized playback is prevented, but detection systems can be easily bypassed via input codes
Solution Approach 1:
The patent introduces an intermediary authentication mechanism between the drive and player that operates at a lower level than traditional watermark detection. By establishing a persistent cryptographic lock at the drive-player interface, the system creates an additional security layer that must be breached before watermark detection even occurs. This intermediary authentication makes bypassing the detection system more difficult, as attackers would need to compromise both the persistent lock and the watermark detection system.
Data Source
Figure 1A
Figure 2
AI summary
An apparatus for processing data and content includes at least one drive and a player (that may be implemented by software). At least some of the content is protected using a content scrambling scheme such as audio or video watermarking. The drive and player cooperate to operate in a lockable mode wherein if protected content is provided to the drive, the drive and player are interlocked so that the content is presented by the player only in accordance with consistent with protection scheme being used, and cannot be presented by any other player. Moreover, in the locked mode, protected content may not be accepted from any other drive. The drive and player are switched to an unlocked mode by presenting to the drive unprotected content.