That's a copyright license, though, which is different from a Terms of Service, which is what the OS X thing is. A copyright license gives positive rights. It

That's a copyright license, though, which is different from a Terms of Service, which is what the OS X thing is. A copyright license gives positive rights. It gives you permission to do something that would otherwise be illegal. If you're not big on copyright, it's easy enough to write a very short license that boils down to "I give you ALL the permission." A ToS takes rights. It's a contract to agree not to do something that would otherwise be legal, in exchange for permission to use the software or whatever. That's why a copyright license boils down to "You can do A, B, C" while a ToS boils down to "You can't do A, B, C". You need to agree to a ToS before using software for it to be valid, since it governs usage, and it can't take away rights unless you agree to it. On the other hand, you don't need to agree to a copyright license, since it only governs copying, and it only grants rights. You only need to read it if you need the rights it grants.