Also... if you already own the game (or any of the DLC), and you want to be able to play it offline (or let a guest play with her or his own account)... you'll need to transfer the license to the console it is to be played on.
I suppose if I ever want to get the DLC for this game that I don't yet have (I only got the free one when I saw it available 3 years ago)... I'm going to have to contact the two companies that seem to have joint ownership of the game license, and either have them make an agreement for sharing the profits (and re-release the game and DLC), or getting one of them to release their stake in it!
On a different note...
I'm still working on getting the Midway Games library back into the hands of a company that will publish it once again!! I'm sure there's scores of people who wish they got: Gauntlet, Joust, Robotron, Smash TV, Root Beer Tapper, Paperboy, Defender. I'm not sure if there were more... those are the only ones I'm aware of (and I only got the first three, that I listed).