Universal, EMI, Sony BMG, Warner and Festival Mushroom are suing Sharman Networks, creator of the file-swapping technology Kazaa, for music piracy in Australia’s Federal Court, according to United Press Intl.
The trial concerns the legality of Kazaa software, which allows users to swap free digital music files over the Internet.
UPI reported the court was told Kazaa had 100 million users worldwide, who share 3 billion music files a month.
Sharman says it encouraged Kazaa users not to infringe copyright laws, but that it cannot control how people use the software.
The trial is expected to last three weeks, UPI said.