Copy protection of optical discs
AssigneeRovi Solutions Corporation
InventorsCarmen Laura Basile, Richard A. A. Heylen
Life of this patent
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Abstract
The more effective is the copy protection provided on a DVD, the greater is the likelihood that the copy protection will adversely interfere with legitimate uses of the disc. In a disc where the content is arranged in physical sectors, it is now proposed to provide subversive regions on the disc having a similar structure to genuine regions. A subversive region and a genuine region will each extend over one or more physical sectors. The subversive region will be provided with physical sector addresses which coincide with addresses of the genuine region. Navigational data will ensure that it is the genuine, rather than the subversive, region which will be accessed during normal play, but the subversive region will effectively hide the genuine region during copying.
Claims16
A copy protected optical disc carrying content and control data arranged in physical sectors, the control data including addresses of the physical sectors for providing access to the content, wherein a genuine region is provided on the disc which extends over at least part of a physical sector and which contains genuine data, wherein a subversive region is also provided on the disc to extend over at least part of a physical sector, the subversive region being similar in structure to the genuine region but containing false data, and wherein the subversive region has physical sector addresses which coincide with physical sector addresses of the genuine region.
A method of copy protecting an optical disc carrying content and control data arranged in physical sectors, the control data including addresses of the physical sectors for providing access to the content, the method comprising:
- providing on the disc a genuine region which contains genuine data and which extends over at least part of a physical sector,
- also providing on the disc a subversive region which extends over at least part of a physical sector, the subversive region being similar in structure to the genuine region but containing false data, and
- arranging for the subversive region to have physical sector addresses which coincide with physical sector addresses of the genuine region.
Dependencies are inferred from the claim text.