Add to that, I don't even know where I can buy a digital copy of most movies. I know I can sorta rent rights to them on amazon, google, etc, but to actually be

Add to that, I don't even know where I can buy a digital copy of most movies. I know I can sorta rent rights to them on amazon, google, etc, but to actually be able to use it as I please and copy from device to device? Itunes is the only one I know to be close to that.