In a method and system for production of a printed document with a unique identifier, the data medium for the unique identifier is applied on a recording medium, the data medium being capable of being electronically written without contact so that data are written without contact onto the data medium...http://www.google.fr/patents/US7347378?utm_source=gb-gplus-shareBrevet US7347378 - Method, device systems and computer programs for producing and tracing printed documents with a determinate identifier
Method, device systems and computer programs for producing and tracing ...
