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FOR a technology that was supposed to revolutionise home entertainment, digital television has been something of a damp squib. Nowhere has it lived up to expectations. In Britain, progress has stalled since the collapse of the broadcaster ITV Digital last April. In the US, the biggest television market in the world, prospects for digital TV look even worse. The public isn’t interested, and it’s not hard to see why: digital sets are expensive, the quality of the broadcasts is questionable, there are plans to outlaw the copying of digital programmes, and cable companies – which serve 60 per cent of…