gooberking: I think it is fair to feel that it is some form of end user control, but I'm not sure I'm willing to extend to it DRM status given that on-line gaming has a certain amount of inherit future-play risk to it.
Pheace: Why not? That's exactly what it is. Digital Rights Management. They don't want you to play that single license online with more than 1 person/copy at a time, hence the key restricts you from doing that. They managed what you can do with it.
It's quite clearly DRM. Just because it doesn't apply to the entire game doesn't negate that fact.
I realize it's a grey area. However, where No-DRM generally allows you to make that decision on your own, by only allowing you one key for your product GOG (or the original developer) basically made that decision/restriction for you.
Normally I think I would be inclined to make that mental leap, but for now I'm sticking with not sure, because I'm not sure if it is or if its just benign enough that I'm not bothered so much about it. Perhaps because its one of those "it hasn't effected me personally," things since the only game I have ever played on-line was UT2004 and I'm quite happy without that ability.
Depending on the scope of what is happening I could be persuaded to rethink my stance. Like when talking about clouding significant content or devs deliberately omitting any off-line modes of play simply to leverage the automatic control inherent to on-line gaming. But then I have to be careful because some games are only possible in a community setting and they should have the right to exist. But then why make games dependent on dev's own servers when players used to be able to create them on their own?