Importance

Loading Importance Indicators...

Abstract

A dual level encryption method, and document, for providing and obtaining a substantially increased amount of optically readable information from an otherwise conventional and highly visible printed bar code pattern area on a document without interfering with the conventional optical reading of the conventional information in the bar code, comprising integrally printing a second and very much finer pattern of encoded optically machine readable glyph code or other such indicia within the bar code pattern area, containing a much higher level of information, to provide two different levels of information within the same area. Scanning the bar code pattern with a conventional bar code reader extracts conventional bar coded information embedded in the bar code without interference from the second indicia. Scanning the same bar code pattern area with a different, higher resolution, optical scanner extracts the much greater amount of information from the second, much finer, optically readable indicia pattern.

Loading the Abstract Image...

First Claim