Program blocking method for use in direct broadcast satellite sy

Details Program blocking method for use in direct broadcast satellite sy Program blocking method for use in direct broadcast satellite sy

1985-03-11

1987-08-04

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380110, 358 86, H04N 7167, H04N 710, H04N 100

Patent

active

046851313

ABSTRACT:
Programming tiers are authorized for viewing on an impulse pay-per-view basis. The system operator controls individual receiver units to block the display of programming on selected tiers because the subscriber finds the content of same objectionable or to prevent members of the household from incurring charges without the subscriber's consent. The broadcast signal includes portions addressable to particular receiver units. These portions include a designation of tiers to be blocked and a command to store same in the unit memory. Upon command to display a program on a selected tier, the memory is accessed and the stored designation compared with the selected tier. Receivers having stored designations corresponding to the selected tier are unable to display the program.

REFERENCES:
patent: 3899633 (1975-08-01), Sorenson et al.
patent: 4292650 (1981-09-01), Hendrickson
patent: 4484217 (1984-11-01), Block et al.
patent: 4494142 (1985-01-01), Mistry
patent: 4536791 (1985-08-01), Campbell et al.

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