OS X is a variant of a BSD UNIX and, if I remember correctly, the license does not* require them to release changes and definitely not free of use.
Also, much of OS X that people like is the Cocoa stuff which most definitely is not covered by a free software license.
>I was under the impression that the Mac license reads 'You agree not to install, use or run the Apple Software on any non-Apple-branded computer, or to enable others to do so.'
That's part of the End User License Agreement, isn't it? I'm not a lawyer, but I remember reading that those aren't legally binding (at least not in sane countries) since they're legal agreements made after the purchase. You didn't agree to it as a condition of the purchase so how can the seller force you to do something after you already own the software?
Also, much of OS X that people like is the Cocoa stuff which most definitely is not covered by a free software license.
>I was under the impression that the Mac license reads 'You agree not to install, use or run the Apple Software on any non-Apple-branded computer, or to enable others to do so.'
That's part of the End User License Agreement, isn't it? I'm not a lawyer, but I remember reading that those aren't legally binding (at least not in sane countries) since they're legal agreements made after the purchase. You didn't agree to it as a condition of the purchase so how can the seller force you to do something after you already own the software?