- MP3 is the dominant format, and is nearly universally supported.[11] The main alternative formats are AAC and WMA. Unlike MP3, these formats support DRM restrictions that are often implemented into files from paid download services. Open source formats, which are completely patent-free, are available - though less widely supported. Examples include Ogg, Vorbis, FLAC and Speex. Finally, a recent newcomer is MPEG 4, which is quickly starting to receive adoption by several digital audio players. (From Wikipedia)
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