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It's interesting that because I said GPL instead of open source, my bad, I'm downvoted to -4. Shit.

Quite a bit of this is sourced from within Apple under Apple's license.

There might be some useful things in there. If they released the code/ patches in an easier to review way. As it is, it's fairly difficult to see if anything

Apple in general doesn’t use gpl code. The vast majority of their work is BSD or BSD-like license.