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YouTube's actions in response to a subpoena it received in May show that it has been keeping tabs on users who post copyrighted material to its site -- and in one case shared the name of a user with lawyers from a Hollywood film studio. On May 24, lawyers for Viacom Inc.'s Paramount Pictures convinced a federal judge in San Francisco to issue a subpoena requiring YouTube to turn over details about a user who uploaded dialog from the movie studio's "Twin Towers," according to a copy of the document.