This version has no DRM at all and no 3rd party stuff like Steam, it’s just a completely stand-alone game you can install and run anywhere. Note that you cannot activate the game on Steam when you get it on GamersGate, the whole idea was to make something that didn’t need Steam or anything.
DRM doesn’t work unless it’s so restrictive that it starts impacting on legit users, otherwise it is fairly useless, so that’s why I’ve gone totally DRM free with Solar 2. So yeah, don’t abuse it! If piracy sky rockets then I’ll try DRM next time as it may end up better overall, but I hope it doesn’t come to that.