A method of, and a system for, selectively delivering still television video with accompanying audio to home subscribers over a cable television system for advertising, promotional or educational purposes. A maximum number of home subscribers can interactively request presentations of their own choosing...http://www.google.com.tw/patents/US4941040?utm_source=gb-gplus-share專利 US4941040 - Cable television system selectively distributing pre-recorded video and audio messages
