Multiple watermarking techniques for documents and other data
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 18, 2001
Issued Date -
N/A
app pub date -
Jul 14, 2000
filing date -
Jan 20, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Multiple digital watermarks, each of which has different characteristics, are embedded in a document. The characteristics of the various watermarks are chosen so that each of the watermarks will be affected in a different manner if the document is subsequently copied and reproduced. The detection process or mechanism reads each of the watermark and compares their characteristics. While wear and handling may change the characteristics of the digital watermarks in a document, the relationship between the characteristic of multiple digital watermarks in a document will never-the-less give an indication as to whether a document is an original or a copy of an original.
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