Adding a new challenge to their list of legal attacks, the record industry and Hollywood studios have joined forces to sue
MusicCity,
Kazaa and
Grokster, which together form one of the most popular file-trading networks to spring up in Napster's wake.
People using these systems can find movies still in theatres, such as "Planet of the Apes" and "Legally Blonde", as well as new releases by recording artists such as Bob Dylan and 'N Sync, a recording-industry trade group said in a release.
But unlike Napster, which eventually agreed to purge its system of copyrighted files in March after a long court battle, Morpheus, Grokster and Kazaa could prove harder to shut down, due to the lack of a centralized list of shareable files.