One or more office instruments FM1 to FMn attaches a tag Tg to sheet and image data documents when a document is to be processed, and transmits the document image data to a security administrative server together with the security tag Tg to be stored there. The security administrative server compares...http://www.google.com/patents/US7032813?utm_source=gb-gplus-sharePatent US7032813 - Security tag using security system and office instrument
