Cryptography – Video cryptography – Video electric signal modification
Patent
1995-04-07
2000-08-01
Laufer, Pinchus M.
Cryptography
Video cryptography
Video electric signal modification
380231, 380239, 380278, H04L 900, H04K 100
Patent
active
060978163
ABSTRACT:
A crypt key system for decrypting encrypted data for use, by a permit key including a decryption key, comprising a database/charging center, a broadcasting station, a receiving device and a communication device. The permit key is supplied to the broadcasting station in advance from the database/charging center. The permit key is broadcast from the broadcasting station. The receiving device receives the permit key via the broadcast. A request for use is executed to the database/charging center via the communication device. The database/charging center transmits the encrypted data via a communication line to the communication device and charges a fee. The communication device decrypts the encrypted data with the permit key received by the receiving device.
REFERENCES:
patent: Re33189 (1990-03-01), Lee et al.
patent: 4736422 (1988-04-01), Mason
patent: 4829569 (1989-05-01), Seth-Smith et al.
patent: 4864614 (1989-09-01), Ceowther
patent: 4864615 (1989-09-01), Bennett et al.
patent: 4890321 (1989-12-01), Seth-Smith et al.
patent: 4995080 (1991-02-01), Bestler et al.
patent: 5029207 (1991-07-01), Gammie
patent: 5091938 (1992-02-01), Thompson et al.
patent: 5144663 (1992-09-01), Kudelski et al.
patent: 5247575 (1993-09-01), Sprague et al.
patent: 5341425 (1994-08-01), Wasilewski et al.
patent: 5504933 (1996-04-01), Saito
patent: 5642418 (1997-06-01), Farris et al.
patent: 5740246 (1998-04-01), Saito
Momiki Shunichi
Saito Makoto
Laufer Pinchus M.
Mitsubishi Corporation
Sayadian Hrayr A.
LandOfFree
Crypt key 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 Crypt key system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crypt key system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-671566