Methods and systems for marking printed documents
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United States of America Patent
Stats
-
Jun 22, 2004
Grant Date -
Feb 6, 2003
app pub date -
Jun 6, 2002
filing date -
May 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Line structures are provided for printed documents to encode plural-bit digital information. The encoded information can be decoded using suitably-equipped processing equipment and used to identify the printed documents. In one implementation the information is repeated differently in a two dimensional pattern of line structures according to a key.
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Cited Art Landscape
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