Exactly @Mineblo: I’m afraid I didn’t get the point clearly because the agreement, which I’ve read a couple of times, refers to third party assets and not IPs as @Astrotronic was referring at.
Builing a map with just a prison, a couple of buildings and some guard towers I guess not worth it; my plan was to build a map empowering the zombie thing by introducing other assets and by creating other buildings with TWDU resources, though it requires a lot of time and effort; but I won’t go further if this can be vanished with just a click if the map wouldn’t be fully compliant to the agreement.
Of course I won’t use any branded prop or asset.