The Ninth Circuit upheld an important limitation on Digital Millenium Copyright Act (DMCA) subpoenas that other federal courts have recognized for more than two decades. The DMCA, a misguided anti-piracy law passed in the late nineties, created a bevy of powerful tools, ostensibly to help copyright holders fight online infringement. Unfortunately, the DMCA’s powerful protections are ripe for abuse by “copyright trolls."