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.

This dispute is the reason the two companies and lawyers representing a group of other copyright holders suing Google, have failed to reach a final agreement on anonymizing personal information belonging to YouTube users, according to two sources close to the situation.

As part of Viacom’s $1 billion copyright suit against Google’s YouTube, a federal judge ordered the video-sharing site two weeks ago to disclose records, such as IP addresses and usernames. Google was also supposed to turn over records that included the viewing and uploading histories of YouTube employees, according to the sources. More>>