Document copying deterrent method using line and word shift techniques
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United States of America Patent
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May 13, 1997
Issued Date -
N/A
app pub date -
Mar 31, 1995
filing date -
Dec 20, 1993
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Abstract
A method is provided that deters the illicit copying of electronically published documents. It includes publishing a plurality of copies of electronically created material to be distributed to a plurality of subscribers. Each copy of subscriber's document has a unique identification code embedded in the document. The arrangement of the code on the document is based on the line-shifting and word-shifting techniques. This is to minimize the effects from noise and distortions on future illicit copies to simplify detection and decoding of the unique code. A codebook is created to correlate each unique code with each subscriber.
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