Security and privacy are key these days.
To find a hotel room was at risk from this sort of breach and to not leave a trace is a big issue in my view.
That said, I would want all the hotels still affected to be able to upgrade and only afterwards advise of a possible vulnerability. Equally, folk wanting to claim because of possible lost items, would need to be on very firm ground.
Read more: http://www.bbc.co.uk/news/technology-43896360
