Kazaa - Wikipedia
Kazaa Media Desktop (/kəˈzɑː/ ka-ZAH).[1] (once stylized as "KaZaA", but later usually written "Kazaa") was a peer-to-peer file sharing application using the FastTrack protocol licensed by Joltid Ltd. and operated as Kazaa by Sharman Networks. Kazaa was subsequently under license as a legal music subscription service by Atrinsic, Inc.,[2] which lasted until August 2012.