Read/write media key block
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United States of America Patent
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Jun 28, 2011
Grant Date -
Jul 13, 2006
app pub date -
Jan 11, 2005
filing date -
Jan 11, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A recorder system contains a media key block (MKB) and selectively writes protected content into a recording medium according to the following content protection logic, to combat theft of the protected content: If the medium does not have a MKB, then the recorder writes its stored MKB into the medium and writes protected content into the medium. If the medium has a MKB that is older than the stored MKB in the recorder, then the recorder writes its stored MKB into the medium before re-encrypting and writing protected content into the medium. If the medium has a MKB that is newer than the stored MKB, then the MKB in the medium is used for content protection. The recorder may store the newer MKB in non-volatile memory, effectively updating its previous stored MKB, so the recorder will have the most recently observed MKB for content protection use.
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