They can have all the prerogatives they want as long as they understand that their prerogatives have no place in a free game. Their artwork may be scaled, resiz

They can have all the prerogatives they want as long as they understand that their prerogatives have no place in a free game. Their artwork may be scaled, resized, and cropped in order to fit into a playing field. The colours may be changed in order to indicate teams. Additional animations may be required for certain actions. The style might need tweaks to fit the existing style of the game. Unmodifiable artwork poses many practical problems for a free game. It's simply unacceptable.