Video signal processor with copy prevention function

Details Video signal processor with copy prevention function Video signal processor with copy prevention function

1995-03-16

1997-09-16

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 15, 380 20, H04N 7167

Patent

active

056688733

ABSTRACT:
A video signal processor is capable of executing on/off control of a copy inhibiting process and rendering extremely difficult any illegal cancellation of the copy inhibiting process by a third person. This video signal processor includes an obstructor for obstructing proper recording of a video signal; a memory for storing a specific code inputted when enabling the obstructor, and also for storing a disable request code inputted in response to a request for disabling the obstructor; a judge device for judging the relationship between the value of the specific code and the value of the disable request code outputted from the memory; and a decider for deciding an operation to disable the obstructor in accordance with the output of the judge means. The memory has a plurality of registers, and at least one of the bit components of the specific code and the disable request code is stored dispersedly in the plural registers in the memory.

REFERENCES:
patent: 3313880 (1967-04-01), Bass
patent: 4510623 (1985-04-01), Bonneau et al.
patent: 4631603 (1986-12-01), Ryan
patent: 4695901 (1987-09-01), Ryan
patent: 4718107 (1988-01-01), Hayes
patent: 5053884 (1991-10-01), Kamijyo
patent: 5130864 (1992-07-01), Shimada
patent: 5157510 (1992-10-01), Quan et al.
patent: 5182771 (1993-01-01), Munich et al.
patent: 5315448 (1994-05-01), Ryan
patent: 5337157 (1994-08-01), Nakata
patent: 5418853 (1995-05-01), Kanota et al.
patent: 5493339 (1996-02-01), Birch et al.
patent: 5559549 (1996-09-01), Hendricks et al.
patent: 5574787 (1996-11-01), Ryan

Affiliated with

Also associated with

Rating

Video signal processor with copy prevention function does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video signal processor with copy prevention function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processor with copy prevention function will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-224081