DRM question

[cfveliz]

I have a very simple question. Does the Windows version of the Penumbra Collection from the Frictional Games Store have any form of DRM?
I recently purchased the Humble Indie Bundle and I got a discount code for the collection but I don't want to install DRM on my machine. I'm assuming that the Linux version doesn't have any DRM so I would be buying that instead, otherwise I would buy both. GamersGate has the games too but 2 of them have SecuROM at their store and I'd prefer to give my support to the developer.