Apple announced on Mac OS Forge
 today that they have open sourced their Lossless Audio Codec (ALAC). 
ALAC was introduced in 2004 as OS X’s core audio codec to compress audio
 files 40-60 percent without losing any quality. The codec is currently 
supported by Macs and the latest iOS devices.
ALAC was reversed engineered in 2005, but more and more applications 
could begin to adapt the codec now that it’s open sourced. Currently 
Plex, VLC, Boxee, and XBMC feature the codec, and there are sure more to
 come. ALAC has been open sourced under the Apache license.
http://9to5mac.com/2011/10/27/apple-open-sources-their-lossless-audio-codec-alac/#more-103148
										    
									     
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