Printing media and methods employing digital watermarking
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United States of America Patent
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Nov 14, 2006
Grant Date -
Jul 14, 2005
app pub date -
Feb 3, 2005
filing date -
Mar 17, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Stationery, or other printable media, is encoded with a digital watermark. The watermark is not conspicuous to a human observer of the media, yet conveys plural bits of auxiliary information when optically scanned and digitally processed. The watermark can be formed by ink-jet printing, or otherwise. The encoded information can be used for various purposes, including authenticating the document as an original, linking to associated on-line resources, and distinguishing seemingly-identical versions of the same document (document serialization).
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