Data recording/reproducing method, data recording/reproducing system, recording apparatus
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United States of America Patent
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Jul 3, 2007
Grant Date -
N/A
app pub date -
Jan 25, 1999
filing date -
Jan 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data recording/reproducing method wherein encrypted digital data obtained by subjecting digital data to first encrypting by using a contents key and encrypted contents key obtained by subjecting the contents key to second encrypting are recorded on a recording medium, the encrypted digital data and the encrypted contents key, having been recorded, are reproduced, and the encrypted digital data is decrypted by using the contents key obtained by decrypting the encrypted contents key, thereby to obtain the digital data.
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