The MPAA and friends are appealing Grokster to the Supreme Court.

Dozens of entertainment-industry companies asked the court to reverse an appeals court decision that has prevented them from shutting down networks like Grokster and Morpheus that they say encourage millions of consumers to copy music and movies for free rather than buying them.

The entertainment industry managed to shut down the first file-trading network, Napster (news – web sites). But Grokster and other networks that have sprung up in its wake claim their decentralized design prevents them from controlling user behavior.