Tamper and copy protected documents

Details Tamper and copy protected documents Tamper and copy protected documents

1993-04-19

1995-10-03

Fridie, Willmon

Printed matter

Method

283105, B42D 1500

Patent

active

054545986

ABSTRACT:
A tamper and copy protected document includesn array of fine blind holes (or, alternatively, of fine perforations) impressed on the document in areas where specific information is to be imprinted. Imprinting of information on the array of holes (or perforations) results in penetration of ink into the fibrous interior of the document, between its surfaces. A resinous coating, applied over the array and over the imprinted information, also penetrates into the interior to encapsulate the ink. A copy protected document is produced by imprinting it with specific alphanumeric information which includes perforations in the imprinted characters.

REFERENCES:
patent: 4163570 (1979-08-01), Greenaway
patent: 4629630 (1986-12-01), Devrient
patent: 5137304 (1992-08-01), Silverschotz et al.

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