Method and apparatus for recorded digital data protection via media volume
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United States of America Patent
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Nov 2, 2004
Issued Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Sep 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of restricting access to recorded digital data on a digital support medium (2) using an integrated circuit e.g. on a smart card (4) containing a first decryption key (Kf) characterized in encrypting with a corresponding encryption key (Kf) one or more elements of the volume descripter (V) of the support medium (2), recording the encrypted elements of the volume descripter together with non-encrypted data on the support medium and, when accessing the support medium (2), using the integrated circuit decryption key (Kf) to decrypt the encrypted elements of the volume descripter (V) and to supply a reader (5) with these elements so as to permit the reading and/or writing of non-encrypted data on the support medium (2).
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