@Vernal, you're wrong on every base.
-Risk being copyrighted is not at issue with respect to Warlight/zone.
-Trademark is the term you're looking for.
-The argument you're looking for is whether or not 'Risk' is generic.
While the standard character mark 'risk' has been abandoned. (http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4801:h4n21q.9.10
), Hasbro maintains the typed drawing mark for 'RISK', which is roughly the equivalent of a standard character mark. It just depends on when you filed for the mark with respect to changing trademark law and terms.
So, as they hold a registered trademark (http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4801:h4n21q.9.2
), and they are actively enforcing their mark (as provided for by Knyte), the term is not generic.
Thus, its an active trademark, which you are not allowed to use unless you have permission from the trademark holder.
The purpose of trademark is to be a service to the consumer. If there is a likely confusion with a consumer seeing a first mark and associating it with the source of goods of another mark, that is possibly a trademark violation for use of the first mark.
If a map used is the exact same images of that of a risk map, then you are in copyright territory. The purpose of copyright law is to ensure the creative efforts of the artists are preserved.
Edited 8/2/2019 17:54:34