Method of encoding confidentiality markings

Cryptography – Electric signal modification – Having production of printed copy

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380 3, 380 23, 380 59, 283 72, 283 73, 283 74, 283901, H04L 900, G09C 500, B42D 1500, B42D 1510

Patent

active

054369746

ABSTRACT:
The invention disclosed here is a method of encoding serial numbers indicating "confidentiality" or "proprietary information" on printed documents. A group of marks in the form of small-sized dots or equivalent markings are repetitively printed across the face of the document. The placement and location of the markings defines a readable binary serial number. Intermixing the markings with the printed matter on the document makes it difficult or impossible to remove the serial number created by the markings, and they will remain on the document after repeated photocopies of it are made.

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