A method of enabling a user to initiate an action via a printed substrate, said substrate comprising user information and coded data, said coded data being indicative of a region identity associated with the substrate and of a plurality of locations on the substrate, said method comprising the steps...http://www.google.de/patents/US7821507?utm_source=gb-gplus-sharePatent US7821507 - Method of providing information via a printed substrate and two-mode sensing device
