A method and system for dispensing and evidencing indicia by an indicia generating device is disclosed in a system having a plurality of indicia generating devices that have been divided into n groups. Each of the indicia generating devices generates and prints indicia on a media that is to be received...http://www.google.es/patents/US7222236?utm_source=gb-gplus-sharePatente US7222236 - Evidencing indicia of value using secret key cryptography
Evidencing indicia of value using secret key cryptography
