Under the strictest copy right laws, which basically disallow mods, it would be a violation to use any part of the maps to make your own maps. You could still make your own maps of the same regions, but such a map would tend to be different. It's likely totally unenforceable, though. If any protection does exist, it should be easy to get around. Problem comes into play not with copying the maps, but with using such maps as part of mods and scenarios, the rules for which are very unclear at this point.