Are terms which explicitly state uses which are otherwise illegal a practical restriction of use? If I put a "You may not commit murder with the Software" term in a license, would that make the software non-free? The additional terms here state that uses which are already illegal aren't allowed ("unlawful or unlicensed copies" and "violate…terms of an Apple operating system software license agreement"). It reads more like a reminder than anything else. It doesn't preclude one from making an Apple-compatible system with the code (as I read it), just not an *actual* Apple system in such a way that breaks other laws or licenses *already*.