A ha! I recognize that map. It's by Jonathan Roberts, who is a member of this guild and goes by the name Torstan. { See Here: World Maps | Fantastic Maps } May I be the first to commend you on your ethics. It was the right move for you to stop using the map when you discovered that it was protected intellectual property.
Needless to say, it is possible for many (several?) members of this guild to produce a map of similar scope and (perhaps, nearly) similar level of quality. Do you have any more specifics about your needs for the map?