Patent ID: 8478080
Filing Date: 2013-07-02
Classification: B41M,B42D,G07D

Abstract:
1. A method of producing a document, the method which comprises: incorporating image information into a plurality of layers of the document, with the image information combining to provide a total image; the image information in at least two of said layers containing digital watermark information; and only a totality of the digital watermark information in said at least two layers forming a security feature for authentication of the document; forming each of a plurality of adjacent strata of the document by a polymer material and firmly bonding the adjacent strata to one another, with the strata forming a composite of polymer material strata and at least two of the adjacent strata comprising polycarbonate material; and printing image information onto surfaces of the layers and thereby forming the image information on at least one of the layers by print materials containing polycarbonate-based binder.