Did they change the licensing recently?
Around 2006 I believe - according to MacWorld http://www.macworld.co.uk/mac/news/?newsid=14663
There is still a significant list of applications / utilities within OS X that are open source, but I believe the Kernel is now closed source and most of the GUI components have always been closed source.
Perhaps my wording was not quite right - it should have said that some elements that were open source that have been modified and the modified versions are now only available as closed source. It does still include open source elements, but it is not a free open source operating system in the same way that say Debian or the open source BSD operating systems are.
BSD: Um. Wrong. Try again. BSD is actually a MORE free license than GPL is
I didn't say BSD is any less free. If you use the GNU/FSF definition of free software
then software is either free or not - there aren't different levels of free. If you tried to create a "freedom value" then you would have to weigh up the freedom of creating closed source derivatives against keeping something free.
Both public domain and copyleft meet all the aims of the GNU definition of free software and are therefore FREE. In fact the GNU definition even specifically states it doesn't need to be copyleft, although copyleft is obviously compatible with the definition as well.
BSD allows you to do what you want, but if you modify the code and don't release that modified code as free software then that modified version is not free as the BSD license doesn't require you to do so. It doesn't have a mechanism to protect the future of derivatives which is what copyleft licenses do provide.
With copyleft then you have to release the source code and can't incorporate it into proprietary code (some exceptions apply eg. if you don't make it available to the public then you can keep your updates secret).
So wrt your above argument the *BSDs aren't OSS then eh?
No I didn't say anything of the sort.
I said that if you modify BSD software and don't release that to the community then the modified version is not free. The various BSD projects do release their software as free software, they meet all the criteria of free software and are obviously open source.