Copy protection schemes for copy protected digital material
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United States of America Patent
Stats
-
Oct 29, 2002
Grant Date -
N/A
app pub date -
Mar 18, 1999
filing date -
Mar 18, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Recent copy-protection schemes for digital video copy-protection rely on a pixel-watermark together with the presence of a `ticket` to implement the `copy-once` state of content. This ticket is designed to entitle the owner of a disk/tape to making one copy of digital content. We disclose a method to pass along this ticket with the video signal after content has been converted to the analog domain. This form of the ticket is called the analog ticket. The analog signal may be recorded on a legacy device that does not comply with the copy-protection scheme (e.g. ordinary VCRs). The analog ticket is designed such that it is automatically removed in these legacy devices. Next generation copies by compliant devices are made impossible. Three possible ways of embedding the ticket signal into the analog video signal are proposed.
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