Presumably you've logged on to all the devices with your iTunes account? OP said he couldn't get the movie on to his girlfriend's iPad. Can an iPad have multiple iTunes accounts associated with it? AFAIK no, and if he had tried to log her out to log himself in, it would have erased her downloaded content.
Ah, isn't DRM beautiful. I'm reminded of a time when a man sitting next to me on a flight couldn't play any downloaded content on his tablet he was not in his home region. Gee, people fly to places outside their home, what a surprise!
Ah, isn't DRM beautiful. I'm reminded of a time when a man sitting next to me on a flight couldn't play any downloaded content on his tablet he was not in his home region. Gee, people fly to places outside their home, what a surprise!