I only have a little experience with the digital copies. You do not have to use iTunes unless you want to put the movie on an apple player. I believe you are given two options when you put the digital copy disc into your computer, at least that is what I've had so far. If you don't like iTunes, just choose the PC version. I think it will show up as a .wmv file for pc. As long as the player you are using is compatible with that format, you should be fine and not need any extra software. You don't need the disc in the computer once you transfer it to the hard drive. I haven't tried playing off an external drive, but I'm sure there is a way to do it. I'm sure someone with more experience will chime in.