From BBC News:
On-demand threatens TV shake-up
The BBC wants to let viewers catch-up with television programmes via the net but the plans are proving controversial.
The world of on-demand threatens to shake traditional TV scheduling to its foundations as people increasingly pick where and when they watch video and audio content.
Media watchdog Ofcom estimates that so-called linear TV could be reduced by up to 30% over the next five years as a result of the wave of on-demand programming competing for viewers' time.
The BBC's on-demand plans, described by Mark Thompson as one of the most important projects undertaken by the corporation, will allow viewers to watch popular TV programmes from the previous week's schedule on their computers or via cable TV.
To watch programmes on their PCs, viewers will have to download a piece of software known as the iPlayer.
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