" I'm not really that interested in Ghosts' attempts to resurrect Need For Speed Most Wanted or Underground." For some games, EA / Origin relies on a third party (one of them may be Good Old Games) to remove a disc protection scheme and replace it with a digital rights protection scheme, but otherwise it's the original game. I think conversion of ProStreet to a digital download was done this way (I'm not sure who did the actual conversion). Other modifications like higher resolutions might be included with the conversion. However, I read that Origin no longer sells ProStreet.
In the case of Undercover, the DVD was only used for installation, and the game was activated online similar to a digital download. However, the Origin version of Undercover was changed enough to make it incompatible with the patches, including 1.0.1.18 which is the patch that adds the Challenge Series and the 3 special edition cars you can win from the Challenge Series.
Somewhat related, Origin no longer sells the Limited Edition of Shift 2 Unleashed, which may be due the Origin server no longer supporting "DLC" content that is actually unlocked as opposed to being downloaded, so even though a player paid for extra content, since the Origin server no sends "unlock" messages when a player logs in, the extra content can't be unlocked. This would mostly affect players that buy the original DVD version of Shift 2 Unleashed Limited Edition from an online retailer like Amazon. I don't know if this affects other games that rely on an unlocking scheme. It seems that removing "unlock" messages from the server occurred 1 or 2 years ago.