Julie188 writes "Microsoft is suing TiVo, claiming patent infringement. Microsoft is doing this because TiVo has sued AT&T — and AT&T happens to be Microsoft's largest customer of Microsoft's Mediaroom IPTV technology. Microsoft says that TiVo has copied Microsoft's Mediaroom IPTV technology in its DVRs. If Microsoft wins, it would effectively block TiVo from selling DVRs without a licensing deal with Microsoft."
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