Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tyler J. McKinley0
Matthew M. Weaver0
Ravi K. Sharma0
Tony F. Rodriguez0
Marc D. Miller0
Date of Patent
March 10, 2009
0Patent Application Number
103823590
Date Filed
March 4, 2003
0Patent Primary Examiner
Patent 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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