Remember you don't have a right to modify a script simple because you can. Usually modification of a copyright work is forbidden and I'll bet Apple strictly disclaim any ability to modify which would otherwise be fair use.
Now, if you changed some piece of the system in order to circumvent FairPlay, or some other DRM component, then you might be running afoul of the DMCA. Not the same thing as copyright violation, however.
(I'm not saying you're incorrect, but being right doesn't make it any cheaper to defend yourself against a dedicated opponent with deep pockets.)