Masquerouge
Deity
They have, perhaps, the least obtrusive DRM and their policies actually promote a lot of things that other DRMs stymie.
As KaeptnOvi pointed out, I believe Stardock has the least obstrusive DRM.
http://uscpwned.blogspot.com/2007/03/developer-stardock-explains-no-drm.html
When Galactic Civilizations II was released with no copy protection whatsoever, some people said that we must not care about piracy. Of course we do. We worked hard on the game and hope/expect people who want it to pay for it. But there are too many times when copy protection and DRM end up hurting legitimate customers.
Stardock and TotalGaming.net don't use DRM. Our delivery program, Stardock Central, uses SSD (Secure Software Delivery) which in essence functions as a way to verify that the user downloading it is who they are (basic activation) but after that, you're done. There's no DRM, digital license, net connection, etc. needed. And even if you lose your serial #, CD, etc. no problem, the automated system will resend you everything you need in email.
A great article to read in any case
