Came across a guy today who was very unwilling to share maps if you know what I'm saying. I'm aware of the general map ownership rules after looking around the forum, but haven't been able to find how to announce in the chatbox
You use the mapowner command. Type ~mapowner and it will show who owns the map. If you are inactive for over 3 minutes and someone else attacks in the map they will take possession of the map.
Type the command ~mapowner and it will display any interactions with the map and who owns it to everyone in the map in their chatbox. Ninja'd