Hmm. I have thoughts (I think), but they're a bit incoherent. I know most of the zone info that was in the Prima guides was the same as originally existed on the official web site. The info that wasn't on the web site was probably written by the CoH team and given to Prima. But, of course, that still doesn't make it non-copyrighted material as far as the Prima guide goes. However, the Prima guide died out very quickly, and I'm pretty sure they're not selling any more copies or making money off of it any more.
I don't know. I'm on the fence on this one, I guess. I'm not exactly encouraging anyone to copy the info from the guide, but I'm not exactly discouraging it, either.