Method and apparatus for determining if an optical disk originated from a valid source
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United States of America Patent
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May 13, 2008
Grant Date -
Jan 13, 2005
app pub date -
Jun 15, 2004
filing date -
Jun 16, 2003
priority date (Note) -
Expired
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Abstract
A method and apparatus for determining if an optical disk originated from a valid source, the method and apparatus scanning one major surface of the optical disk for mechanical surface imperfections, storing the locations of the surface imperfections relative to a datum, comparing a parameter of each of the locations of the surface imperfections with corresponding parameters of a master disk of known source for determining if the disk originated from the source from which the master disk originated.
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