I have decided against buying 2 copies of "King Arthur's Gold" to play against my daughter, because of the DRM this game contains. It was a slightly surreal experience trying to explain about DRM and principles (remember those GOG?) to a seven-year-old, and why we were not going to play KAG after all.
Although this is a subjective issue, I have no problem with requiring online activation with multi-player games when you're playing on the publisher's or developer's servers. To my mind that's checking that you've paid for the s/w in order to access a service that they are providing and paying for.
What I do have a problem with is that KAG requires online activation to play on a LAN when one of the machines on the LAN is hosting a local server. All my own work, so to speak - nothing to do with them. This is, in my opinion, definitely DRM.
In three years' time, if my daughter and I pull our old paid-for installers out of mothballs to play a nostalgic game against each other, we won't be able to if the KAG authentication server is no longer around. That's the primary reason I came to GOG 5 years and 180 games ago.
This is DRM, and I feel that GOG is being disingenuous when they say "DRM free" just because *part* of the purchase is DRM-free.
p.s. Sorry, I forgot to say thanks to triock for the link to the answer to my original question.
Post edited January 11, 2015 by Narny