In Doe defendant's appeal from a denial of their motion to quash a subpoena served on an Internet service provider seeking the identities of people who illegally downloaded music, the order is affirmed where: 1) the motion to quash the subpoena was not dispositive of the underlying action; 2) to the extent that anonymity is used to mask copyright infringement or to facilitate such infringement by other persons, it is unprotected by the First Amendment; and 3) defendant's expectation of privacy for sharing copyrighted music through an online file-sharing network was simply insufficient to permit him to avoid having to defend against a claim of copyright infringement.