On April 17, 2009, a Swedish court convicted four men operating The Pirate Bay Internet site of criminal copyright infringement. The Pirate Bay was established in 2003 by the Swedish anti-copyright organization Piratbyrån to provide information needed to download film or music files from third parties, many of whom copied the files without permission. The Pirate Bay does not store copies of the files on its own servers, but did provide peer-to-peer links to other servers on which infringing copies were stored. Apparently the theory of the prosecution was that the defendants, by their conduct, actively induced infringement. Under U.S. copyright law, this would be a so-called "Grokster" theory of infringement liability.