NPR's John McChesney reports that Napster -- the online music site that allows its users to "share" music files -- was back in court today. The Recording Industry Association is suing Napster for copyright infringement. A federal appeals court in San Francisco heard arguments today on whether a lower-court decision against the company should be allowed to go into effect. Napster's allies have warned that the company will be forced out of business if the lower-court ruling stands.

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