In addition to UNIXgod's comment, I can refer you to: http://en.wikipedia.org/wi...

		jebblue on May 30, 2013 \| parent \| context \| favorite \| on: Ubuntu's Bug #1 is fixed In addition to UNIXgod's comment, I can refer you to: http://en.wikipedia.org/wiki/OS_X There you will find: http://en.wikipedia.org/wiki/Comparison_of_BSD_operating_sys... "... Apple Inc.'s iOS and Mac OS X, with its Darwin base including a large amount of code derived from FreeBSD." http://en.wikipedia.org/wiki/Darwin_(operating_system) "Darwin is an open source POSIX-compliant computer operating system released by Apple Inc. in 2000."

Yes, Apple has used free BSD code to build an OS that is not open source. I don't think anyone would dispute that.