Any purchase of a game, movie or other digital media is just buying the license. Yes, if you buy a "physical" copy you do own the disc, but that is all you own, you don't actually own a copy of the movie, just a license and the disc that they put the files on. Even old VHS movies, you own the tape, not the movie itself. If they decide to later discontinue that medium, you will not get another version without buying it again and if something goes weird on the licensing end, you may find that your copy "updates" and is no longer playable. So while buying physical might give you the illusion of owning something more, you don't have much legal ground to stand on, though it is rarely an issue and physical is usually better for transferring around than streaming. With streaming purchases, you own the license and not much else. You can stream it wherever there is Internet and the application is available and you log into your account, but you don't usually have the ability to download or actually keep a local file of the media. There are exceptions, but just streaming is preferred by the suppliers since they retain the most control over the media. The fine print is where you figure out how hollow it all really is.
