Protected document and method of making the same

Details Protected document and method of making the same Protected document and method of making the same

1977-12-15

1979-09-18

McGehee, Travis S.

Printed matter

Calendar

B42D 1500

Patent

active

041680880

ABSTRACT:
Disclosed is a document which is made secure from illegal copying by color copiers. The invention comprises including in the printed document a warning word of phrase which is made up of picture elements which are less dense than its surrounding background, but the density changes gradually and not sharply with respect to the surrounding background density.

REFERENCES:
patent: 3282720 (1966-11-01), Oleksiw
patent: 3675948 (1972-07-01), Wicker
patent: 4033059 (1977-07-01), Hutton et al.
patent: 4066280 (1978-01-01), LaCapria

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