Originally Posted by trboyden
I think the interesting aspect of all this, which was mentioned earlier, is the fact that Apple doesn't own all the copyrights to the code base of OS X. I also find interesting that no one has gone after Apple for not providing access to the source code of the Intel kernel, which is, as far as I know, still based on the Mach BSD kernel. It is my understanding that they should have to provide the source code because it is Open Source, however, I'm more familiar with the terms of GPL licensed software and there may be loopholes in the BSD license that give them an out.
BSD style licenses only require that the original authors are attributed. There are no loopholes in those licenses: they explicitly allow that.
3 clause BSD license
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It is unfortunate that many people think all open source code has to be licensed with conditions similar to the GPL. While the GPL certainly serves a purpose, it does not serve every purpose, even when restricted to the domain of free software.
Regarding Apple, even though Apple doesn't have to, most of the BSD licensed code in OSX does have the source publicly available, and GCC and other GPL'd software have the source code and modifications posted in the same place as the source for the BSD code.