Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2002-02-01
2008-11-18
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C380S201000, C380S203000, C713S502000
Reexamination Certificate
active
07454621
ABSTRACT:
The invention relates to a method and an arrangement for recording an information signal with first copy protection information to a storage medium using recording means, the recording being performed according to first copy rules identified by the first copy protection information. The method comprises the steps of detecting said first copy protection information identifying said first copy rules, recording at least second copy protection information according to said detected first copy rules, said first and at least second copy protection information identifying a legality message to be interpreted by reading means, the at least second copy protection information changing within a predefined time interval after the change in said detected first copy rules according to an interpreting rule.
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Maes Maurice Jerome Justin Jean-Baptiste
Staring Antonius Adriaan Maria
Talstra Johan Cornelis
Besrour Saoussen
Koninklijke Philips Electronics , N.V.
Sheikh Ayaz
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