Ogg Vorbis

Ogg Vorbis is an audio compression format, comparable to other formats used to store and play digital music, but differs in that it is free, open and unpatented. The Ogg Vorbis specification is in the public domain and if freely available for commercial or noncommercial use. In Ogg Vorbis, Ogg refers to the Ogg Project which is an Open Source multimedia initiative, while Vorbis is the actual compression format.