System and method for digitally marking a file with a removable mark
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 14, 2004
Issued Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Apr 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system enables encoding of a removable mark into digital data, and decoding of the mark from the digital data. The system comprises an encoder and a decoder. The encoder includes a target area locator for locating in digital data a predetermined pattern of values that represents a flat area, and a marker for modifying values in the flat area to encode a mark into the flat area. The decoder attempts to extract the mark from the digital data. The decoder includes a mark area locator for locating a predetermined pattern of values in digital data, and an unmarker coupled to the mark area locator for examining the values to determine the state of each value and extract an embedded mark from the predetermined pattern of values.
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