Stream-ripping is when an illegal copy is made of legally streaming music. One of the biggest known offenders is Germany-based website YouTube-mp3.org. All three major labels have mounted a lawsuit against the site, which makes audio copies of the audio from YouTube videos.
A study earlier this year from the IFPI also pointed to stream-ripping as a serious piracy issue for music. Previous Muso research also showed that piracy is making a similar change to legal music consumption, with shifts toward seeking access instead of outright ownership.