In an important test case for the rights of P2P users, a federal judge has ruled that Verizon must turn over the identity of a subscriber who allegedly has been downloading more than 600 copyrighted songs a day from a file-trading site.

U.S. District Judge John Bates determined that the 1998 Digital Millennium Copyright Act (DMCA) requires the ISP to give the Recording Industry Association of America (RIAA) the name of its subscriber, a Kazaa user who has also posted hundred of swapable music files.

The RIAA has other ways to try to force Verizon to turn over the name, but it wants to rely on the DMCA. It points to section 512 of the Act, which permits a copyright owner to subpoena a "service provider" to supply information about a subscriber without a judge's approval.

Verizon argues that section 512 does not apply to ISPs because service providers only convey the file request to the P2P service, and do not host the potentially infringing material on their own servers. Ironically, Verizon was one of the parties that originally negotiated the DMCA and attempted to focus the debate on constitutional issues without raising a direct challenge to the Act. 

Bates swept aside Verizon's argument claim ruling that "the court concludes that the subpoena authority of section 512 applies to all service providers within the coverage of the Act, including Verizon."

In a 37-page decision, Bates wrote: "Under Verizon's reading of the Act, a significant amount of potential copyright infringement would be shielded from the subpoena authority of the DMCA. That would, in effect, give Internet copyright infringers shelter from the long arm of the DMCA subpoena power, and allow infringement to flourish."

The Supreme Court's recent ruling upholding the extension of copyrights also seemed to give Bates ammunition to defend what he claimed was Congress' intent in the DMCA. He said that decision upheld "the wisdom of Congress' action" which he was not entitled "to second guess."

A group of 12 consumer and privacy rights organizations filed an amicus brief for Verizon which argued that section 512 of the DMCA was unconstitutional because it violated the right to online anonymity. "Purported copyright owners should not have the right to violate protected, anonymous speech with what amounts to a single snap of the fingers,'' they wrote.