Non-counterfeitable documents

Details Non-counterfeitable documents Non-counterfeitable documents

B - Operations, Transporting

42

D

283/24

B42D 15/02 (2006.01)

Patent

CA 1124277

NON-COUNTERFEITABLE DOCUMENTS ABSTRACT An invalidating marking appears on photorepro- ductions of security documents such as checks, bonds, stock certificates, lottery tickets, and currency. The invalidating marking is disguised on the original by use of disguising markings and printing the invalidating mark and the background with different line screen frequencies.

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