This excerpt taken from the DIS 10-K filed Dec 7, 2005.
Pay-Per-View (PPV): Generally about two months after the home entertainment window begins, the studios television distributor, Buena Vista Television, licenses titles to cable, satellite and internet platforms for showing on a pay-per-view basis. PPV services, such as iN DEMAND and DirecTV, deliver one-time rentals electronically to consumers televisions at a price comparable to that of physical media rentals. Video on Demand (VOD) is an extension of PPV, and currently shares the PPV window. The PPV/ VOD window generally lasts about three months.