Patent ID: 8736910
Filing Date: 2014-05-27
Classification: B41M,G03G,G07D

Abstract:
1. A method for securing a document, that comprises: a first step of printing a first mark on a first surface of said document by utilizing a first printer, a second step of printing a second mark on another surface of said document or in the depth of said document by utilizing a second printer, the two marks are superimposed, and at least one of said marks presents, as a result of ad-hoc unpredictable printing phenomena of its printer, a rate of ad-hoc errors that is greater than a first predefined value, wherein at least one of said marks is a mark whose copy, made using a printer identical to the printer utilized for printing said mark and using a same resolution, causes an error rate, measured dot by dot, that is greater than a second predefined value.