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Typically, this container format contains the Vorbis compressed audio codec (similar to MP3's lossy audio, but open-source and free)—although it may contain other codecs, such as Speex (extension is spx; this codec is for spoken audio, rather than for music; it is open source and free), Flac (lossless audio; it is open source and free), Theora (lossy video; it is open source, and free), etc.