The 'medal of honor' games are well within the legal boundries of a 'new game'.
It is thus highly illegal to distribute them freely -free of charge-
This is concidered Piracy (read: the unauthorized illegal copying of copyrighted software for home or commercial use), which goes against all copyright rules made at the Berne Convention.
Further -more in depth- information on copyright laws can be found here:
US Copyright Office
These laws are administered in most countries