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That said, it is rather simple to consider : as a general idea, the UI layer (Cocoa for OS X, CocoaTouch for iOS) and a few other things are closed. The rest is pretty open, as darwin in general is OSS.


Not the lower "Darwin" layers of iOS, they've never released that.


The "darwin layer" in iOS is fairly inexistant. When have you started a shell on a non-jailbroken iPhone? ;)


I actually meant all the lower layers including kernel and drivers etc. Which do exist, and have not been released.

http://en.wikipedia.org/wiki/Darwin_(operating_system)

"Darwin is now only available as source code,[4] except for the ARM variant, which has not been released in any form separately from iOS."




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