Recorder/reproducer and content data protection system for preventing unauthorized use of content
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United States of America Patent
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Dec 21, 2010
Grant Date -
Oct 2, 2008
app pub date -
Mar 11, 2005
filing date -
Apr 20, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The recorder/reproducer, when moving a first content data, writes a second content data, which is obtained by re-coding the first content data recorded in a first recording medium, into a second recording medium instead of the first content data, writes one or more first partial information extracted from the first content data into the second recording medium, and makes the first content data irreproducible, using one or more first invalidated partial information having one-to-one correspondence with the extracted one or more first partial information. When restoring the first content data, it makes the irreproducible first content data reproducible, using the one or more first partial information recorded in the second recording medium.
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