It's Atari's 40th birthday today! If you have the Atari's Greatest Hits app, then upgrade to the latest version and you can download all the games for free. This offer is only good for today only (June 27, 2012) and if you delete or reinstall the game, you lose access. So I guess it means you don't own the game but you can play them as long as you keep them.
http://appadvice.com/appnn/2012/06/a...gaming-history