[CTDOCodebases]

It sounds like Apple don’t even own it then if they can’t prevent people from pirating it.

[amarshall]

It has nothing to do with actually preventing all infringement, but instead seeking enforcement in at least some cases. If a copyright owner is aware of substantial infringement and chooses not to pursue (or license) they may lose their copyright through genericization or other means.

(Caveat: I’m not a lawyer, but I learned broadly the above from an IP lawyer.)

[ben_w]

I can’t prevent someone from robbing me, just make it harder for them to do so and have legal recourse if they do it anyway.

This still counts as “having control”.