The founder of sites MP3Tunes.com and Sideload.com, which boasted a catalog of more than 400,000 recordings by 40,000 artists between them, has been found liable for copyright infringement by a New York federal court.

Michael Robertson was found to have infringed works by plaintiffs Capitol Records, EMI and others. The case dates back to 2007.

Robertson's two sites let users upload and listen to music, but also - crucially - to "sideload" music from third-party websites to their ...