Is Mac OS X open source?

Posted by hasen j on Super User See other posts from Super User or by hasen j
Published on 2009-08-07T09:22:21Z Indexed on 2011/01/16 1:55 UTC
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osx

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unix

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apple

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open-source

I learned recently (on superuser) that Mac OS X uses the bash shell. I also know that OS X has a UNIX core.

I was searching for information about OS X and Open Source on google, but what I found was this site:

http://www.opensource.apple.com/

Which seems to include the source code for OS X.
For instance, one of the links reads: Mac OS X 10.5.7 Source

So, is OS X open source?

There's an Apple Public Source License, but I'm bad at understanding legalese.

Update

Extra/Bonus question:

Besides the kernel, What about the various other pieces? The X server? Window Manager? File explorer? etc. What's open source and what's not?

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