Lexor: It seemed that GOG to make KB DRM free used 3rd party crack which locked out many game's functions.
As a veteran of TBS I started my 1st game in KB on highest difficulty and I spend days/weeks on this game session but I wasnt able to finish it at all because of many bugs in quests. That spoiled whole KB series to me. Never played this part of KB again and also never played any other KB.
Nasty... I got KB:TL from a (now-defunct) gaming magazine from here... In Feb 2010 it was. DRM-free as far as I recall. I mean, sure it didn't require disk in drive and quite sure it didn't require any on-line activation, since I recall that Two Worlds 2, also from that magazine, did require that and I was pissed at the new development, so it hadn't happened before.
And don't remember any issues with it.