Information distribution system

Details Information distribution system Information distribution system

1992-04-24

1993-09-21

Buczinski, Stephen C.

Cryptography

Cryptanalysis

358 84, 358 86, 455 2, H04K 102, H04B 1700, H04N 700

Patent

active

052475751

ABSTRACT:
An information distribution system provides information to a user, when the information corresponds to criteria individually selected by the user, and then charges the user only for the selected information thus provided. Encrypted information packages (IP's) are provided at the user site, via high and/or low density storage media and/or by broadcast transmission. The IP's selected by the user are decrypted and then printed or displayed for viewing by the user. The charges for the IP's thus displayed are accumulated within the user apparatus and periodically reported by telephone to the system's central accounting facility which issues encryption keys. The encryption keys, used to decrypt the IP's, are changed periodically. If the central accounting facility has not issued a new encryption key for a particular user station, the station is unable to retrieve information from the system when the key is changed.

REFERENCES:
patent: 4361851 (1982-11-01), Asip et al.
patent: 4467424 (1984-08-01), Hedges et al.
patent: 4586078 (1986-04-01), Citta et al.
patent: 4695880 (1987-09-01), Johnson et al.
patent: 4780757 (1988-10-01), Bryer
patent: 4789863 (1988-12-01), Bush
IEEE Journal on Selected Areas in Communication, "The Application of Digital Broadcast Communication to Large Scale Information Systems", David Gifford, John Lucassen, Stephen Berlin, May 1985, Journal vol. SAC-3, No. 3.

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