Disclosed is a system for allowing on-demand delivery of data, such as MPEG-2 compressed video data, to a subscriber from a content server. The system utilizes a managed IP network that is coupled to the one or more content servers that allows the content servers to deliver data such as video, audio,...http://www.google.com.tw/patents/US20020046406?utm_source=gb-gplus-share專利 US20020046406 - On-demand data system
