BT and TalkTalk lose copyright bid © Reuters/Toby Melville BT and TalkTalk have lost their Court of Appeal challenge against Government plans to tackle copyright infringement online. They asked three appeal judges to overturn a High Court ruling backing controversial measures intended to curb illegal internet file-sharing, which are estimated to cost them some £400 million a year. BT and TalkTalk, two of the UK's largest internet service providers (ISPs), say the proposed measures are incompatible with EU law. Their lawyers also argued at an appeal court hearing in January that the measures would result in an invasion of privacy and run up disproportionate costs for ISPs and consumers. Lady Justice Arden, sitting with Lord Justice Richards and Lord Justice Patten, disagreed and dismissed their appeal.