Here you have a new technology, and if that technology is going to work, you must allow people to provide central indexes of the data. It's just like a newspaper that publishes classified ads.
Allow Central Classified Data Going
Napster's only alleged liability is for contributory or vicarious infringement. So when Napster's users engage in noncommercial sharing of music, is that activity copyright infringement? No.
Alleged Contributory Copyright Engage Liability
The Audio Home Recording Act directly says that noncommercial copying by consumers is lawful.
Audio Consumers Copying Directly Home
When you think of Napster, you think of music. But the first thing that struck me was that this was an important case not only for the music industry but for the whole Internet.
First First Thing Important Industry Internet