Inventor
LOFGREN NEIL
US4 patents
Patents
4 patentsUS6608911B2Aug 19, 2003
Digitally watermaking holograms for use with smart cards
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Authentication of physical and electronic media objects using digital watermarks
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Digital watermarking systems
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US7249257B2Jul 24, 2007
Digitally watermarked maps and signs and related navigational tools
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