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Internet file-sharing services will be held responsible if they intend for their customers to use software primarily to swap songs and movies illegally, the Supreme Court ruled Monday, rejecting warnings that the lawsuits will stunt growth of cool tech gadgets such as the next iPod.

The unanimous decision sends the case back to lower court, which had ruled in favor of file-sharing services Grokster Ltd. and StreamCast Networks Inc. on the grounds that the companies couldn't be sued. The justices said there was enough evidence of unlawful intent for the case to go to trial.

File-sharing services shouldn't get a free pass on bad behavior, justices said.