High security pay television system

Details High security pay television system High security pay television system

1987-09-22

1990-03-13

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 7, 380 16, 380 20, 380 15, H04N 7167

Patent

active

049088343

ABSTRACT:
A high security pay television system is provided in which television receivers include a decoder and with periodically changed removable memory modules. The decoder only functions to properly descramble the scrambled broadcase signal when a changeable system-wide code is available in the decoder. The code can either be carried in the memory module, or an internal code unique to the decoder and resident in the decoder can be combined with an external code in the removable memory module, and also unique to that decoder, to generate the common systemwide system code. Program viewership is written on the removable memory module which is returned to a central facility for later subscriber billing.

REFERENCES:
patent: 3538243 (0000-01-01), Shanahan et al.
patent: 3736369 (1973-05-01), Vogelman et al.
patent: 4068264 (1978-01-01), Pires
patent: 4081832 (1978-03-01), Sherman
patent: 4091417 (1978-05-01), Nieson
patent: 4163254 (1979-07-01), Block et al.
patent: 4163255 (1979-07-01), Pires
patent: 4222068 (1980-09-01), Thompson
patent: 4225884 (1980-09-01), Block et al.
patent: 4250524 (1981-02-01), Tomizawa
patent: 4338628 (1982-07-01), Payne et al.
patent: 4354201 (1982-10-01), Sechet et al.
patent: 4369462 (1983-01-01), Tomizawa et al.
patent: 4396947 (1983-08-01), Cheung
patent: 4417101 (1983-11-01), Serres et al.
patent: 4424532 (1984-01-01), den Toonder et al.
patent: 4460922 (1984-07-01), Ensinger et al.
patent: 4484027 (1984-11-01), Lee et al.
patent: 4494143 (1985-01-01), Lovick et al.
patent: 4503462 (1985-03-01), Kelley et al.
patent: 4528588 (1985-07-01), Lofberg
patent: 4531020 (1985-07-01), Wechselberger et al.
patent: 4536791 (1985-08-01), Campbell et al.
patent: 4599647 (1986-07-01), George et al.
patent: 4696034 (1987-09-01), Wiedemer

Affiliated with

Also associated with

Rating

High security pay television system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High security pay television system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High security pay television system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-56080