SHOUTcast

Created in 1999, SHOUTcast is a proprietary server for streaming media developed by Nullsoft. It allows digital audio content, primarily in MP3 or HE-AAC format, to be broadcast to and from media player software, enabling hobbyists and professionals to create Internet radio networks. At least one GPL'd compatible streaming system also exists, Icecast.

http://en.wikipedia.org/wiki/SHOUTcast

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