As most know you can download any game from the novalogic ftp
http://ftp.novalogic.com/C3/
But i noticed recently they have updated the game files to have the latest version, same as steam version but in the Nova directory.
Some games now have CD Keys like Armored Fist 3 and F22L3 which from memory never did in the past, nor do they with steam
So from what i can see there are 4 different versions of DF Games
THQ Nordic (
http://ftp.novalogic.com/C3/)
GOG.com (DRM Free)
Steam (Steam Library Copy)
CD Copy (CD Disc)