Cryptography – Key management – Having particular key generator
Patent
1995-05-10
1996-07-16
Cain, David C.
Cryptography
Key management
Having particular key generator
380 10, 380 20, 348 3, 348 4, 348 55, H04N 7167
Patent
active
055374735
ABSTRACT:
A video recorder system adapted to receive subscription television services is of the type which controls access to the subscription services by means of a smart card. Where payment is due for each program received, the viewer is required to make a positive affirmation of purchase by pressing an affirmation button as the program is received. To enable reception in the absence of the viewer by use of the programmer in the recorder, the programmer is provided with means actuable by the viewer when a programmer is being set into the programmer. An indication of whether an affirmation of payment is associated with the program to be recorded is stored in the programmer, and when the program to be recorded is received, automatically authorises the descrambler control circuit, which charges the card and enables the descrambler as though the affirmation button had been pressed.
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Amstrad Public Limited Company
Cain David C.
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