In an almost complete reversal of previous victories for the record labels and movie studios, federal court Judge Stephen Wilson ruled that Streamcast--parent of the Morpheus software--and Grokster were not liable for copyright infringements that took place using their software. The ruling does not directly affect Kazaa, software distributed by Sharman Networks, which has also been targeted by the entertainment industry.

"Defendants distribute and support software, the users of which can and do choose to employ it for both lawful and unlawful ends," Wilson wrote in his opinion, released Friday. "Grokster and StreamCast are not significantly different from companies that sell home video recorders or copy machines, both of which can be and are used to infringe copyrights."