A system that facilitates the purchase and delivery of audio and video content (e.g., entertainment media) over the Internet is disclosed. In a preferred embodiment, the disclosed system allows a user who hears or sees an audio or video broadcast to use a cell phone or other wireless device to order...http://www.google.com.tw/patents/US6507727?utm_source=gb-gplus-share專利 US6507727 - Purchase and delivery of digital content using multiple devices and data networks
