The RFID tag or other identifying device is used to store certain information identifying each play participant...http://www.google.es/patents/US6967566?utm_source=gb-gplus-sharePatente US6967566 - Live-action interactive adventure game B???squeda avanzada de patentes N???mero de publicaci???nUS6967566 B2Tipo de publicaci???nConcesi???n N???mero de solicitudUS 10/410,583 Fecha de publicaci???n22 N