The verdict could be a step toward helping music and film companies seeking to recoup millions of dollars in lost revenues from filesharers, though analysts said they doubted it would stem the tide of illegal downloading.

"The Stockholm district court has today found guilty the four individuals that were charged with accessory to breaching copyright laws," the court said in a statement. "The court has sentenced each of them to one year in prison." Companies including Warner Bros., MGM, Columbia Pictures, 20th Century Fox Films, Sony BMG, Universal and EMI were also asking for damages of more than 100 million crowns ($12 million) to cover lost revenues.

The court also ordered the defendants to pay over 30 million Swedish crowns ($3.58 million).

The men linked to The Pirate Bay Peter Sunde, Gottfrid Svartholm Warg, Fredrik Neij and Carl Lundstrom were charged early last year by a Swedish prosecutor with conspiracy to break copyright law and related offences. Lundstrom's attorney Per Samuelson told journalists he was shocked by the guilty verdict and the severity of the sentence.

"That's outrageous, in my point of view Of course we will appeal," he said.

"This is the first word, not the last. The last word will be ours." The group that controls The Pirate Bay launched in 2003, has maintained that since no copyrighted material is stored on its servers and no exchange of files actually takes place there, they cannot be held responsible for what material is being exchanged.

Industry specialists were not convinced the verdict would have a lasting effect. "Every time you get rid of one, another bigger one pops up. Napster went, and then up came a whole host of others ... The problem of file-sharing just keeps growing year on yeal and it's increasingly difficult for the industry to do anything about it," said music analyst Mark Mulligan of research firm Forrester "Pirate Bay was brilliant at self-publicity, but the reality is there are lots of other torrent-tracker sites," said Dan Cryan, senior analyst at media research firm Screen Digest. "The closing of the one that shouts the loudest won't make any difference."