I doubt that this was solely intended as a 'screw you' to jailbreakers. More likely, it's because Apple can't guarantee the integrity of DRM on a jailbroken sys

I doubt that this was solely intended as a 'screw you' to jailbreakers. More likely, it's because Apple can't guarantee the integrity of DRM on a jailbroken system, and that's one of the terms in their contracts with publishers.