Record carrier with watermark
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United States of America Patent
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Sep 21, 2010
Issued Date -
N/A
app pub date -
Aug 15, 2007
filing date -
Nov 14, 2000
priority date (Note) -
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Abstract
A record carrier includes a pattern of substantially parallel tracks for storing data in the form of marks, in which the data is encoded by a channel code. A watermark is provided by controlling the parameter of the channel code so as to introduce a predetermined run length distribution in the marks on the record carrier. Brightness differences are caused by introducing this run length distribution.
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