Cryptography – Key management – Having particular key generator
Patent
1985-11-25
1987-12-01
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
235382, 2353825, 358 84, 379 91, 379 92, 379209, 380 20, 455 2, H04N 7167, H04N 710, H04M 1100
Patent
active
047109556
ABSTRACT:
A method and apparatus to enable billing of subscribers of pay-per-view television systems or the like on a non-real-time basis. A scrambled television signal is received at a subscriber terminal from a headend. The received signal is selectively descrambled in response to subscriber action indicating acceptance for viewing of a program contained in the signal. A record is maintained at the subscriber terminal of the billable programs accepted for viewing by the subscriber. The signal received from the headend is monitored by the subscriber terminal for a call-in command which instructs the subscriber terminal to forward the record of billable programs to the headend. A telephone communication path is established between the subscriber terminal and the headend in response to the call-in command. The record of billable programs is transmitted to the headend over the telephone communication path, and the subscriber is billed in accordance therewith. A plurality of transaction credits can be downloaded from the headend to the subscriber terminal, stored therein, and debited in response to the acceptance by a subscriber of a billable program for viewing. The descrambling of a program is prevented if there are not sufficient stored transaction credits available to pay for the program. A time-out count can be maintained in the subscriber terminal and reinitialized in response to a signal received from the headend. Descrambling of billable programs is prevented at the subscriber terminal if the time-out count expires.
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Buczinski Stephen C.
General Instrument Corporation
Lipsitz Barry R.
LandOfFree
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