Respondents Grokster, Ltd. and StreamCast Networks, Inc. distribute free software products that enable computer users to share electronic files through peer-to-peer networks. Grokster's software employs FastTrack technology while StreamCast distributes Morpheus software that relies on Gnutella technology. Users of either product can send requests for files directly to the computers of others on the network, with results communicated back and files downloaded directly from peers' computers without any central server intercepting the content.
A group of copyright holders including motion picture studios, recording companies, songwriters, and music publishers, referred to collectively as MGM, sued Grokster and StreamCast in the United States District Court for the Central District of California. MGM alleged that the companies knowingly and intentionally distributed their software to enable users to reproduce and distribute copyrighted works in violation of the Copyright Act. MGM commissioned a statistician to conduct a systematic search, and his study showed that nearly 90% of the files available for download on the FastTrack system were copyrighted works. Well over 100 million copies of the software in question are known to have been downloaded, and billions of files are shared across the FastTrack and Gnutella networks each month.
Grokster and StreamCast concede the infringement in most downloads, and it is uncontested that they are aware that users employ their software primarily to download copyrighted files. From time to time, moreover, the companies have learned about their users' infringement directly, as from users who have sent e-mail to each company with questions about playing copyrighted movies they had downloaded, to whom the companies have responded with guidance. MGM notified the companies of 8 million copyrighted files that could be obtained using their software.
After the notorious file-sharing service, Napster, was sued by copyright holders for facilitation of copyright infringement, StreamCast gave away a software program of a kind known as OpenNap, designed as compatible with the Napster program and open to Napster users for downloading files from other Napster and OpenNap users' computers. The evidence that Grokster sought to capture the market of former Napster users is sparser but revealing. Grokster launched its own OpenNap system called Swaptor and inserted digital codes into its Web site so that computer users using Web search engines to look for "Napster" or "[f]ree filesharing" would be directed to the Grokster Web site. StreamCast monitored both the number of users downloading its OpenNap program and the number of music files they downloaded. It also used the resulting OpenNap network to distribute copies of the Morpheus software and to encourage users to adopt it. Internal company documents indicate that StreamCast hoped to attract large numbers of former Napster users if that company was shut down by court order or otherwise, and that StreamCast planned to be the next Napster.
Finally, there is no evidence that either company made an effort to filter copyrighted material from users' downloads or otherwise impede the sharing of copyrighted files. Grokster and StreamCast receive no revenue from users, who obtain the software itself for nothing. Instead, both companies generate income by selling advertising space, and they stream the advertising to Grokster and Morpheus users while they are employing the programs.
After discovery, the parties on each side of the case cross-moved for summary judgment. The court nonetheless granted summary judgment in favor of Grokster and StreamCast as to any liability arising from distribution of the then current versions of their software. The Court of Appeals affirmed. The Supreme Court granted certiorari.
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