A method of performing an action is disclosed. The method starts by sensing a print medium to obtain data encoded on a surface of the print medium. The data encodes at least a print media identifier. The print media identifier is determined from the data and a digital copy of a document is retrieved,...http://www.google.fr/patents/US7817989?utm_source=gb-gplus-shareBrevet US7817989 - Method of performing an action using a printed medium
Method of performing an action using a printed medium
