The BBC will launch its long-anticipated Video On Demand online service in November, after being granted approval by the BBC Trust. Using its proprietary iPlayer, a Windows-only application, viewers will be able to download a wide range of BBC channel content for up to seven days after network transmission. The Beeb predicts that the iPlayer will account for as much as 7.5 per cent of network viewing by 2011. While platform neutral, the system will use DRM to control the amount of radio and TV that can be downloaded. Material can be kept for 30 days before it expires.