What possible license issues with FLAC? The F stands for Free.

http://flac.sourceforge.net/license.html

 Quote:
FLAC is a free codec in the fullest sense.
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The FLAC and Ogg FLAC formats themselves, and their specifications, are fully open to the public to be used for any purpose (the FLAC project reserves the right to set the FLAC specification and certify compliance). They are free for commercial or noncommercial use.
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Neither the FLAC nor Ogg FLAC formats nor any of the implemented encoding/decoding methods are covered by any known patent.



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-Chris