@whoever wants to play the Steam version of the game DRM-free and can't wait until the automatic patch is available:
* Simply replace the .exe and run the .exe from the installed directory (default is: C:\Program Files\Steam\steamapps\common\divinity ii - dragon knight saga\bin)
@darkling: you can't use the steam client to run a "changed" .exe. If you replace the .exe and then try to launch the game via Steam, it's not going to work. Running it directly from the installed directory should work just fine as it is not linked to securom or steam in any way.
If you don't want to play around with .exe's on Steam, it's best to simply wait until the DRM-free patch is available on Steam via automatic update.