Neo7: Since Linux distributions are open-source, everyone can modify or use a part of it. So do Apple. But I'm not sure if it has legal restrictions or not. Anyway, you're right. Apple is not that much creative (but I'm not against apple. I write these things now using my iPad )
BSD and equivalent licenses requires that derivatives must also also conform to the BSD (or others) license (which is not something that Apple does when it can avoid doing so).