Method and apparatus for copy protection
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Nov 9, 1998
filing date -
Jun 9, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Copy protection techniques that utilize a watermark and a permission key are disclosed. The copy protection techniques can provide single-copy copy protection in addition to different levels of copy protection. The permission key and the watermark can also permit the invention to yield variable levels of copy protection. In one embodiment, content including a watermark is transmitted to a recipient. The recipient is allowed to read the content but not record the content unless the recipient possesses a permission key.
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