Verizon has condemned the ruling claiming that it will have a "chilling effect on private communications".
In a statement Sarah B Deutsch, VP and associate general counsel for Verizon said: "The court's decision has troubling ramifications for consumers, service providers and the growth of the Internet.
"It opens the door for anyone who makes a mere allegation of copyright infringement to gain complete access to private subscriber information without the due process protections afforded by the courts."
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