“Best map for Heroes of Might and Magic III” (2009).

I don't know much about the program. It allows you to process maps that are ALREADY ready. As far as I know, it adds protection by appending information (a certain number of bytes) to the map header, which allows the game to recognize the map, but not the editor. If you study it a little, you can find out what this information is and then add code to the executable file of Heroes - the place where the map is generated. The program itself is here, but a slightly more advanced version was also posted somewhere: http://h3disk.narod.ru/download/files/sd.rar