Master digital data creation device and digital data reproduction device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 11, 2006
Grant Date -
Dec 6, 2001
app pub date -
Jun 4, 2001
filing date -
Jun 6, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Data C generated by scrambling user-desired digital data P and a control word CW.sub.p corresponding to the number of reproductions p are recorded on recording media. When creating a master, a user has already been charged for the number of reproductions p. A decryption block decrypts the control word CW.sub.p, which is read from the recording media, to CW.sub.0. A de-scrambler uses the decryption control word CW.sub.0 to decrypt the digital data P for output to a reproduction unit. After confirming the end of reproduction, the decryption block writes a control word CW.sub.(p-1) back to the recording media. The recording media may be reproduced p times with no need for communication between a reproduction device and an accounting manager.
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