Digital watermarking security systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 10, 2009
Grant Date -
Dec 2, 2004
app pub date -
Mar 4, 2003
filing date -
Apr 30, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A variety of systems responsive to watermarked documents are detailed. In one, watermarking is employed to facilitate system access. In another, security is provided through analyzing digitally watermarked documents. In yet another, a digital watermark-based combination lock is adapted to analyze a sequence (and perhaps an orientation) of presented digitally watermarked cards.
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