Several commercial models relating to the payment for online content are disclosed herein. In lieu of prior art username/password combinations to gain access to exclusive on-line content, a tangible asset, namely a smart card, is used. Access is automatically granted when the smart card is inserted into...http://www.google.com.hk/patents/US20040103064?utm_source=gb-gplus-share專利 US20040103064 - Models for marketing and selling access to on-line content
