20th Century Fox served YouTube with a subpoena Wednesday

20th Century Fox served YouTube with a subpoena Wednesday demanding the Google-owned viral video site disclose the identity of a user who uploaded copies of entire recent episodes of primetime series “24″ and “The Simpsons.”

The subpoena, which first came to light on the blog Google Watch was granted by a judge in U.S. District Court for the Northern District of California after being filed by the News Corp.-owned studio on Jan. 18. It is not yet known whether YouTube has complied with the request.

In addition, a second, lesser-known video site, LiveDigital, was also served with a similar subpoena.

A Fox spokesman confirmed the subpoena was filed to both YouTube and LiveDigital and served but declined further comment. A spokesman for YouTube declined comment.

The “24″ episodes in question actually appeared on YouTube prior to their primetime Jan. 14 premiere on the Fox broadcast network, which spread four hourlong episodes of the hit drama over two consecutive nights. Fox became aware the episodes were on YouTube on Jan. 8, according to the subpoena.