Posted April 10, 2020
Ok now this is clearer to me.
Blastprocessor42: Can you link to that workaround? I haven't seen any permanent fixes for DEFCON's DRM.
So, what I wrote above is relevant to the single-player game.
If you start the game from the DEFCON Multiplayer link (Windows shortcut) instead and start a LAN game from there, then yes it does seem to check the activation keys and complains both players are using the same key, and refuses to start the LAN game (except in demo mode). That duplicate key is the default key that comes with the freshly installed game.
However, if you go to the game options and add the other key that you can find from your account page to the other player, then the two players don't have the same key and they can play together. However, I guess this means that with one purchased copy of the game, max two players can play the game together (but then I understood the demo mode lets max five players play together...).
Also, it seemed that when you entered that other code, the game went online to check that it is a valid key, so it might be this will work (switching the key from the default one) only as long as some validation servers are online. If so, I guess the LAN games will stop working for everyone (except in demo mode) if and when the validation servers go offline. Unless, the key validation is somehow calculated offline, it didn't occur to me to disable the internet connection when changing the key for the other player... Maybe that still needs to be tested, ie. is the new key really validated online, or offline.
So it does seem the multiplayer part (including the LAN games) indeed has DRM, as it checks that the players are not using the same key. The singleplayer game does not have DRM.
Post edited April 10, 2020 by timppu