I wonder if places using systems such as this will have to declare it plainly?<p>If they do, seems like there might be some backlash, with people preferring not to go to businesses starting down the path of using this sort of tech and spending more time in those which could, but choose not to, use it.<p>Assuming of course it doesn't end up just completely ubiquitous like web ads etc, the market <i>could</i> force tech like this into the high-risk margins, i.e. high-end jewellery shops etc, rather than it eventually popping up in every pub and high-street shop.<p>I will say though, having written that, I do think it's likelier it'll just end up ubiquitous.