Re: Smudges?
If it is "ultrasonic" the smudges shouldn't matter, and those smudges would be replaced by other smudges when someone else touched it so even if that was it it would only work once. I'm sure the article would have mentioned if it was a one shot deal.
My guess is that she trained it with her "fingerprint" with the screen protector on, so basically a flat thumb without any ridges at all has been registered for her. That would explain why anyone else can open it - I'll bet the handle of a broom could open it in that case.
Not sure how Samsung thinks they can fix this via software, that's the limitation of using ultrasonics is that sound moves differently through different materials. A "gel" screen cover is going to be too similar to human flesh for there to be any way to distinguish. The only solution will be a warning to not using a gel type cover.
Biting the hand that feeds IT
