There's Vexorians Map Optimizer... it is the best one I think, you can also use "Heavylock", but that once caused my map to Fatal Error. You can also protect your map the easy way:
Create 2 empty text documents
Import them
Change the custom path of the first one to: war3map.wtg
Change the custom path of the second one to: war3map.w3g
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.