Non-copying printed document and method of printing same

Details Non-copying printed document and method of printing same Non-copying printed document and method of printing same

B - Operations, Transporting

42

D

283/24

B42D 15/00 (2006.01)

Patent

CA 1098145

Abstract of the Disclosure A document with a background printed thereon which in- cludes a first portion formed of small dots and a second portion formed of larger dots. The larger dots are of a size which is reproduced by a copying machine. The small dots are of a size which is not reproduced by the copying machine. When a copy is made, only the larger dots reproduce so that the copy is readily distinguishable from the original.

328554

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