HereForTheBeer: The way I read this, it means it's okay - so long as it follows the other rules. Exchange "watch" with "play" and there you have it. Assuming, of course, that I'm not missing some blurb about only one instance of the game running at a time on that server farm.
P1na: GOG explictly asks (with a please) not to install your games on a friend's machine. We're talking simultaneous installs on other people's machines here, I'd say it's pretty clear. I'm not going to say I consider this an absolute rule to guide my life by, but I do find it quite distateful to ask on GOGs own forums for help to bypass that.
I get that, but it's still fairly gray. Sticking with the bit about movies - since gOg themselves make the comparison - there are no restrictions about how many people can watch the movie on the same screen. Could this apply to games for LAN play? Eeehhhh... they don't quite come out and say it, and functionally there isn't a difference between your own multiple PCs and friends PCs -
so long as the friends uninstall the title(s) before leaving the premises. Or maybe I'm being a bit too lenient with the definition of "household". Probably am.
Ultimately, here's my practical take:
- If you have multiple PCs at the house and want to install the game on all of them, then they allow that.
If the rules also allow multiple instances running at the same time, then I think he's in the clear so long as LAN play can be managed without quasi-legal or illegal workarounds with regard to individual keys.
- If the friends are bringing over their own PCs then it would seem that they should also have the means to purchase the game(s) in question, so tell them to stop being such cheap-asses and buy the game for themselves.
- Or the host, being in the Christmas spirit blah blah blah, could gift copies to the visiting friends.
Whatever the case, just buy the titles. Most don't cost that much, and
we should treat the DRM-free honor system, well, honestly.