Optical Disc Copy Protection Using Subversive Data Segmentation
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Solution Overview
Problem
Existing copy protection methods for optical discs often interfere with legitimate uses, risking adverse effects on playback as they become more effective at preventing copying, leading to a trade-off between security and usability.
Innovation Solution
Incorporating unreadable or subversive data regions on optical discs that are not accessed during normal playback, ensuring they do not interfere with legitimate use while hindering copying processes by being inaccessible or causing errors when attempted to be copied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more effective copy protection methods are applied to prevent copying, then copy security is improved, but legitimate playback functionality deteriorates
Solution Approach 1:
The patent divides the data area into distinct regions: a first region containing copy protection data and a second region containing playable content. This segmentation allows the copy protection mechanism to operate independently without interfering with legitimate playback of the second region, resolving the contradiction between security effectiveness and playback functionality.
Solution Approach 2:
The copy protection data is extracted and isolated into a separate first region that is physically or logically separated from the second region containing playable content. During normal playback, the system accesses only the second region, effectively removing the copy protection data from the playback path while maintaining its protective function.
2Object-generated harmful factors
If unreadable or subversive data is added to enhance copy protection, then copying capability is reduced, but data access during playback may be blocked
Solution Approach 1:
The data area is segmented into a first region for copy protection data and a second region for playable content. The copy protection system accesses only the first region during copying operations, while playback systems access only the second region, preventing any interference between copy protection functionality and legitimate playback.
Solution Approach 2:
A region separator or boundary mechanism acts as an intermediary between the copy protection data and playable content. This separator ensures that during normal playback, the system naturally bypasses the unreadable or subversive data in the first region, allowing uninterrupted access to the second region's content.
Data Source
AI summary
Generally the more effective is the copy protection provided on an optical disc, such as a DVD, the greater is the likelihood that the copy protection will adversely interfere with legitimate uses of the optical disc. It is therefore proposed to include at least one region of subversive data within the content in the data area of an optical disc, and then to prevent access to each such region of subversive data during normal playback of the disc. For a DVD, the subversive data may be incorporated within video objects and/or may be in gaps between files in the DVD_Video zone. It is arranged that there are no navigable paths to the regions of subversive data.