Kelefane: These games need to be on GOG. They are the very essence of games that GOG usually has here but they aren't. I wonder how bad the licensing hell is involving these games and if GOG has inquired about them before? (Or plans to?)
They won't talk about stuff like that but you can be sure they did, I would be extremely surprised if they didn't. And from that you can gather that the licensing hell is probably really bad. But you won't get any official confirmation.
In the meantime you could search for "Dungeon Master: Return to Chaos" which is a freeware game that very faithfully recreates the experience of the original, Chaos strikes back, and I think even DM II. So far no license owner has filed a complaint about it.