http://news.cnet.com/8301-1023_3-9989783-93.html

NOW, Viacom wants to know which videos YouTube employees have watched and uploaded to the site, and Google is refusing to provide that information, CNET News has learned.....

Google balked over the issue of turning over information that would include data about videos employees watched or uploaded to YouTube. If Chad Hurley, one of YouTube's co-founders, uploaded a copyright video or viewed them, Viacom's lawyers believe they have a right to know about it, the sources said.