Can you play a movie after the digital copy is already downloaded on a device?

I was just wondering if you put a digital copy movie disc on one of your devices (PC, Mac, iPhone, iPod, iPad) would you ever get the chance to watch the DVD again? I'm talking about the DVDs that carry the movie itself and the digital copy.

Of course you can only if you get the right format of the digital copy movies for you devices. If not, you should convert them to the right one.