Why would they need to know? You go to a bike shop, buy a Dahon, simple. I don't really see what impact it might have on the bike shopper. Even for me, knowing that there are two companies, what does it matter? As long as I like the bike and it does what I need it to do, then whoever has control of factories or whatever and court cases, let them slide. I'll ride.
If yoy suffer from "no life", a bad temper and a pinch of paranoia such things suddenly becomes WERY important I am afraid. Sad.