As noted in many other places, the very lack of a mark is exactly why these cannot be used in places where they have to be certified. Anyone that accepts it in

As noted in many other places, the very lack of a mark is exactly why these cannot be used in places where they have to be certified. Anyone that accepts it in that case, is in the wrong. And you do get to escape liability with disclaimers quite well. Just look at every tax reporting agency out there. Massive disclaimers about how you are still liable for any mistakes they may make.