I believe only the physical version is completely DRM free. The Steam version uses Steam DRM (obviously), while digital versions from Amazon, Impulse, etc. all use Tages-SolidShield for a single online activation after installing.
you can run the game outside of Steam, (steam is not running)
 
	 
				 
 
		 
	 
	 
	 
 
		 
 
		

 
 
		 
 
		 
 
		
