Enhanced copy protection of proprietary material employing multiple watermarks
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United States of America Patent
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-
Aug 16, 2005
Grant Date -
Sep 12, 2002
app pub date -
Mar 6, 2001
filing date -
Mar 6, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus for distributing proprietary material employs multiple watermarks embedded in the proprietary material for enhanced copy protection. A first watermark is to be processed by programmable and non-programmable devices configured to process the first watermark for copy protection of the proprietary material. If a programmable device eliminates the first watermark so that unauthorized copies of the proprietary material can be made, then non-programmable devices configured to process a second watermark as well as the first watermark look for and process the second watermark for copy protection of the proprietary material upon their failure to detect the first watermark.
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