A subscription television system is provided that transmits a plurality of television signals to a plurality of subscribers. The television signals include pay-per-view programs (purchased by feature) or near-video-on-demand programs (purchased for a period of time for unlimited viewing) that are provided...http://www.google.de/patents/US5592551?utm_source=gb-gplus-sharePatent US5592551 - Method and apparatus for providing interactive electronic programming guide
