Optical disk having electronic watermark, reproducing apparatus thereof and copy protecting method using the same
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United States of America Patent
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Dec 3, 2002
Grant Date -
N/A
app pub date -
Sep 8, 1998
filing date -
Sep 16, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A copy protecting method for an optical medium includes a writing step of writing watermark data as ECC data in a data storage area of a disk having a certain data stored therein.
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