The apple iphone is based some on freeBSD code. Some of that code is GPL'd. Suppose APPLE used some of that code GPL'd code. I doubt the lawyers are smart enough to understand it, and am sure some lazy programmer probally over looked the fact. Then wouldn't they be bound to release that code? I don't know how parts of freeBSD are licensed out, but someone who knew could look at the object files and see if the some of that GPL'd code is in there, and then demand that apple release the code.