Apparatus and method for preventing unauthorized use of information recorded on an information recording medium
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United States of America Patent
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Sep 11, 2001
Grant Date -
N/A
app pub date -
Oct 1, 1997
filing date -
Oct 9, 1995
priority date (Note) -
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Abstract
An information recording medium includes a lead-in area and a data recording area. Key information is recorded in the lead-in area. Scrambled data is recorded in the data recording area. The scrambled data is descrambled based on the key information.
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