libvorbis: Vorbis is a general purpose audio and music encoding format libvorbis: contemporary to MPEG-4's AAC and TwinVQ, the next generation beyond libvorbis: MPEG audio layer 3. Unlike the MPEG sponsored formats (and other libvorbis: proprietary formats such as RealAudio G2 and Windows' flavor of the libvorbis: month), the Vorbis CODEC specification belongs to the public domain. libvorbis: All the technical details are published and documented, and any libvorbis: software entity may make full use of the format without license libvorbis: fee, royalty or patent concerns. libvorbis: