Good question! With a digital copy i send you a code and you go to the website, in this case the website is http://www.flixster.com/ultraviolet/harrypotter7part2/ On this website you will be prompted to enter the code that i'll send you, and then you can begin downloading your movie, either to your computer, android, iphone or ipad, or just watch it online, whenever you want to :) it's a pretty convenient way to watch movies.
I'm not 100% sure if it would be compatible with your smart tv, but here's the main website, that hopefully should be able to answer any questions :) http://uvvu.com/