Phantom Button Copy Protection for Optical Discs
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Solution Overview
Problem
Current copy-protection techniques for optical discs are vulnerable to sophisticated rippers that can parse navigation information, allowing unauthorized copying by avoiding subversive data placed outside the navigation path.
Innovation Solution
Incorporating 'phantom buttons' into the navigation data that are invisible to users but identifiable by rippers, associated with subversive data that inhibits copying or degrades copy quality, ensuring that even navigation-parsing rippers inadvertently copy detrimental data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subversive data is placed outside the navigation path to prevent copying, then copy protection is improved, but sophisticated rippers can parse navigation information and avoid copying such data
Solution Approach 1:
The patent inverts the traditional approach by placing subversive data inside the navigation path rather than outside it. Phantom buttons are embedded within the navigation structure, forcing rippers to copy them when following navigation paths, while legitimate players ignore them due to timing constraints. This inversion makes the navigation path itself the vehicle for delivering subversive data to copies.
Solution Approach 2:
The patent introduces phantom buttons as intermediary elements that mediate between the navigation system and subversive data. These phantom buttons act as carriers that transport subversive data through the navigation path to the copy, while being invisible and unselectable by legitimate users. The phantom buttons serve as the intermediary mechanism that enables sophisticated copy protection against parsing rippers.
2Ease of operation
If phantom buttons are made invisible to users, then ease of operation is improved, but detection and measurement becomes more difficult
Solution Approach 1:
The patent applies local quality by making specific regions of the display (where phantom buttons are located) have different properties from the rest of the interface. Phantom buttons are positioned in areas with specific visual characteristics (such as dark regions or areas matching background patterns) that make them invisible to users but detectable by ripper software through navigation data parsing. This localized differentiation enables the dual function of being user-invisible while machine-detectable.
Data Source
AI summary
Recording data for an optical disc such as a DVD has video content data and navigation data. Button data defines one or more user-selectable selection buttons to enable a viewer to select content data when the recording medium is played. Further button data defines at least one phantom button that is not selectable by a viewer because, for example, it is not visually distinguishable, it is hidden within the video data or it is displayed for a short period of time. Although the at least one phantom button is not selectable by a viewer, a copying apparatus parsing the recording data will erroneously identify the phantom button as a user-selectable selection button and will copy data associated with the phantom button. The data associated with the phantom button may adversely affect the copying process or render the copy unplayable or unwatchable.