Master digital data creation device and digital data...

Details Master digital data creation device and digital data... Master digital data creation device and digital data...

2006-07-11

2006-07-11

Sheikh, Ayaz (Department: 2136)

Cryptography

Video cryptography

Copy protection or prevention

C726S031000, C705S057000, C705S058000, C380S202000, C380S203000

Reexamination Certificate

active

07076063

ABSTRACT:
Data C generated by scrambling user-desired digital data P and a control word CWpcorresponding 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 CWp, which is read from the recording media, to CW0. A de-scrambler uses the decryption control word CW0to 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(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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Robert Garran Offices, ‘Copyright & Contract’, Copyright Law Branch, AG's Dept., Commonwealth of Australia, 2005, Ch.4, http://www.ag.gov.au/agd/WWW/rwpattach.nsf/viewasattachmentPersonal/(CFD7369FCAE9B8F32F341DBE097801FF)˜4Chapter4.pdf.

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