Imagine looking up at the sky and seeing every cloud crammed full of adverts. High above a fast food restaurant, a competitor has scrawled its own cheeky pitch, urging shoppers to eat their burgers instead.
This future is nearer than you might think: last month saw the launch of the first augmented reality app that lets anyone write on the sky. And, according to a report released this week by a global law firm, advertisers are worried.
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