It's not that big a difference: ports require source but remakes still require the rights unless you change all sounds, graphics and the storyline to something that does not resemble the original anymore.
I admit your post says remake, your choice of words was fine, above my post it turned into port again and that got me going. It just seems like this topic is turning into "Hey I got a ludicrous idea, wanna hear about it?". That way it loses it's purpose.