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Clang is also free... Just not your preferred definition of Free.

Free as in free beer, not free as in free speech :P

The FSF considers BSD a free software license, it's just non-copyleft. There was a lot of discussion on Groklaw about taking BSD code, modifying it, and slapping a GPL license on top. I believe the consensus was this is OK, since you are still respecting the BSD license terms.

also from http://www.gnu.org/philosophy/free-sw.en.html...

>Freedom 3 includes the freedom to release your modified versions as free software. A free license may also permit other ways of releasing them; in other words, it does not have to be a copyleft license. However, a license that requires modified versions to be nonfree does not qualify as a free license.

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