cjrgreen: They have a "household rule".

FAQ: 9. Can I install one game both on my laptop and desktop computer at home?
Yes. We do not limit the number of installations or reinstallations, as long as you install your purchased games on computers in your household. So yeah, if you've got a render-farm in the basement, you might actually break the world record for the number of legal Fallout installations in one household. However, if you think about installing your game on a friend's machine or sharing it with others then please don't do it, okay?

Depends on how far you're willing to go in considering your roommates and their computers to be your "household". I don't think it's their intent, though you could argue it's within the letter of the rule.

Anyway, as long as your friends bought GOG licenses for the games (that is, you're not stretching the truth: they're not just meaning to buy GOG licenses, they actually bought them; they're not thinking they're entitled to GOG licenses because they have a physical or Steam copy of the game), I don't think they'd have a problem with it, but the administrators are the only ones who could give an official answer.

Coelocanth: I can't dream of a scenario where in this specific case it wouldn't be okay. 3 licenses bought and two of them gifted to the very people he wants to allow to copy the game onto their computers. How could there be any question at all about this?

derekguenther: One part I was concerned about has been answered, I should have explicitly asked it as well: many games require you to have a unique serial key especially to play multiplayer. I assume the original Total Annihilation was like that, though before GOG I've never played it. If GOG was somehow building the serial key in per account it would make sense that we'd have to each download it. Since part of GOG's core tenets is "DRM free" I did not think that would be the case, but the person who mentioned the installers would be bit-for-bit identical addressed that concern.

Thanks everyone for responding! You've satisfied my curiosity and helped me make it through the Badlands, we will probably be getting them downloaded in the next hour. I'll pick an "answer" post once I'm at my computer and can see the website a little easier.

derekguenther: I tried a quick search of the forum and with Google, but searching with my phone is proving difficult.