Unauthorized use preventing method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus
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United States of America Patent
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Nov 9, 1999
Issued Date -
N/A
app pub date -
Oct 11, 1996
filing date -
Mar 18, 1992
priority date (Note) -
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Abstract
In a method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area, first information is read from the user inaccessible area of the recording medium. The first information is compared with second information concerning a true recording medium (lawfully produced copy). It is then concluded that the recording medium is the true recording medium when the first information corresponds to the second information.
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