DRM from Frictional Games Store?

[m1qb]

Hi. I already purchased Amnesia through Steam like a year ago, but I was thinking I might purchase through the Frictional store depending on what kind of drm, if any, would be tied to that version. The eula makes it seem like it would be drm-free, but I'm not sure, so I thought I'd ask since I already have the game on Steam anyway.
So, what is it? When I buy the game, do I just get the install files and that's it? Do I have to connect to a server if I reformat or something?

Thanks for answers in advance.