CATV system and method of curtailing reception of unauthorized s

Details CATV system and method of curtailing reception of unauthorized s CATV system and method of curtailing reception of unauthorized s

1986-01-17

1987-08-18

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, H04N 7167

Patent

active

046882499

ABSTRACT:
An "Anti-Piracy" system and method are disclosed which includes an FSK modulator at the head end CATV transmitting location which, in response to data from an addressing computer, randomly issues Anti-Piracy commands (APC) which are transmitted to the set-top converters in the system. The converters are programmed to anticipate an interrupt in the FSK RF signals following the reception of an APC signal. The system and method are designed to curtail piracy by the use of audio recording techniques which have been used to obtain unauthorized service.

REFERENCES:
patent: 4058830 (1977-11-01), Guinet et al.
patent: 4115807 (1978-09-01), Pires
patent: 4130833 (1978-12-01), Chomet
patent: 4268859 (1981-05-01), Ost
patent: 4325078 (1982-04-01), Seaton et al.
patent: 4388643 (1983-06-01), Aminetzah
patent: 4396947 (1983-08-01), Cheung
patent: 4464678 (1984-08-01), Schiff et al.
patent: 4550341 (1985-10-01), Naito

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