Optical filter software copy protection

Details Optical filter software copy protection Optical filter software copy protection

1991-06-03

1993-08-03

McElheny, Jr., Donald E.

Facsimile and static presentation processing

Facsimile

Recording apparatus

380 54, 358253, H04N 592

Patent

active

052334368

ABSTRACT:
An interactive video system has a video display for displaying camouflaged information which is discernible only when viewed through a partially transparent viewing screen having zones with light transmission characteristics corresponding to the characteristic of respective displayed image regions. The user of the system is required to input information which can be derived only by recognizing the camouflaged information with the aid of the screen.

REFERENCES:
patent: 2832821 (1958-04-01), Du Mont
patent: 2914603 (1959-11-01), Gabriel
patent: 3561850 (1971-02-01), Shaffer
patent: 3657474 (1972-04-01), Turnrose
patent: 4776013 (1988-10-01), Kafri et al.
patent: 4821321 (1989-04-01), Bramley

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