Securing of documents by means of digital watermark information
AssigneesBayer Material Science AG, Bundesdruckerei GmbH
InventorsEdward Springmann, Manfred Paeschke, Oliver Muth
Life of this patent
Estimating the term…
Abstract
In the production of a document, image information is incorporated into a plurality of layers of the document such that the pieces of image information are combined into a total image. The image information in at least two of the layers includes digital watermark information. The entirety of the digital watermark information in the at least two layers forms a security feature for an authentication of the document. The invention further relates to a respective document, a method for authentication, and a device for authentication.
Claims17
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.
An article of manufacture, comprising:
- a plurality of layers forming the document, each of said layers having image information incorporated therein and said image information combining to form a total image;
- said image information in at least two of said layers containing watermark information;
- and
- only a totality of the watermark information in said at least two layers forming a security feature for authentication of the document;
- wherein a plurality of adjacent strata of the document are formed in each case by a polymer material and said adjacent strata are firmly bonded to one another and said strata form a composite of polymer material strata, at least two of said adjacent strata comprising polycarbonate material;
- and
- wherein the image information is printed image information on at least one of said layers with print materials containing polycarbonate-based binder.
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;
- only a totality of the digital watermark information in said at least two layers forming a security feature for authentication of the document;
- incorporating the watermark information in different layers in such a way that, in a case of nonselective optical acquisition of the image information, based on a single layer, said watermark information forms a first piece of total information and, on selective optical acquisition of the image information, based on the individual layers, forms a second piece of total information which is different from the first piece of total information.
Dependencies are inferred from the claim text.