Jeffrey Katzenberg, the man who revived Disneys animation studios before co-founding Dreamworks, knows a thing or two about Hollywood revolutions. He believes that, if cinema is going to survive against its rival mediums, then the way films are sold is going to have to change in a big way. Since most movies make the bulk of their money within the first three weekends in cinemas, the executive believes that the release window will be limited to that 17-day period.