A system for conducting an agreement between two parties relying on a trusted a third party includes a first party generating a first view of the agreement and transmitting the first view of the agreement to the third party, a second party independently generating a second view of the agreement and transmitting...http://www.google.com.hk/patents/US7801826?utm_source=gb-gplus-share專利 US7801826 - Framework and system for purchasing of goods and services
