Grokster and other peer-to-peer programs like Morpheus and Kazaa allowed users to directly trade files between each other without using a centralized server, unlike earlier programs like Napster. These peer-to-peer programs are accused of copyright infringement for enabling users to share copyrighted files. Whether Grokster constitutes infringement depends on if it can be shown to actively induce infringement or take meaningful steps to prevent illegal file sharing.