A dilemma

[LonewandererD]

My Creative Commons license does allow for the modification of my maps and I did not use a program to make my landmasses, they were hand drawn.

-D-

[Redrobes]

Well if SA then he is if ND then he isn't. I went on the Deviant page but I could not see the license. In the absence of one he would not be able to use a clone of your map. In this case or the ND case it comes down to how close the maps are. I would advise tho if going for a CC license then putting the CC logo and SA/ND tags actually on the map so that you have some proof of how it was licensed at the time it was uploaded. He would then have less grounds to complain if confronted.

You might try to do a google similar images on both yours and his map image and see if it crops up on other forums and places just to get some idea of the guy your opposing. He might be very reasonable about it.

Thats about as much advice as I can give - you need a lawyer for taking it any further.