A US District Court Judge Louis L. Stanton has ruled that Google must turn over to Viacom logs showing what videos have been watched on YouTube and when. The information will include login names and IP addresses for the viewers.

Viacom is suing the search giant for YouTube’s alleged failure to live up to their legal responsibility for actively combating piracy on the service. Google has owned YouTube in 2006.

Viacom lawyers are claiming that YouTube intentionally turned a blind eye to copyright infringement because of the traffic it generated, and they’re hoping to show that YouTube officials knew, or should have known, the correllation between popularity and piracy.

Google argued that providing usernames and IP addresses to Viacom raises potential privacy issues, but ironically the judge used a statement previously published by a Google software engineer against them.