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The lawsuit, filed against Prodigy Communications Wednesday in a New York federal court, follows BT's claim in June that it owns the intellectual property rights to hyperlinks. BT says the patent, discovered in a routine trawl through its own patents three years ago, also covers a basic technology necessary for connecting computer users to the Internet. The telco aims to require all ISPs who use hyperlinks -- a fundamental Web technology -- to pay BT a licence fee.