Ah, so it's the MacNeill Bros. I thought they just worked for Sierra, I didn't know they had a seperate company of sorts... BTW, I listened to the advice and googled for the copy protection answers, which are supposed to be in the history book I'm missing, and I passed! So I got to see this screen myself! Thanks for the great advice.
Anyway, one mystery is solved, another one replaces it! This is the screen you get (instead of the one posted above by BerserkerTails) if the game is cracked: (note - if you can't see it, try refreshing or click
here)
As you can see, it's not only that the MacNeill logo is missing, but the entire scenery has changed, from a night scene with dark mountains to a sunny scene with grass and trees! How can that happen?!