Flipper, I'm not responding in order to further argue with you, but rather to say that I found the article posted by Boredlawyer to be super informative and especially wrt your point (not wrt to NDA at all, but) wrt the legal duty to correct mistaken statements vs the duty to update when something that was true when disclosed that becomes no longer true. Your generic example could fall into either bucket, depending on the specific. I urge you to check out the article - I think you would also find it well worth reading when you have 10 minutes. Several of the most relevant summary points: