Copy protection for recorded media
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United States of America Patent
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-
Jul 13, 1999
Grant Date -
N/A
app pub date -
May 2, 1997
filing date -
May 2, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus for securely transferring an encrypted-data key and a medium key, from a media storage such as a DVD disk to an output device in a computer system, using a randomly generated first secure transfer key generated by a disk drive of the computer system, the first key having a uniqueness factor derived from a phase locked loop circuitry. The first secure transfer key is combined with an output key stored in the output device forming a second secure transfer key. The second secure transfer key is used to encrypt the data key and the medium key to form a third secure transfer key. The third secure transfer key is passed to the output device where the data key and the medium key are decrypted. The data key and the medium key are then used by the output device to decrypt encrypted program data from the disk.
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