Apple ad-blocking software scares publishers but Google is target

Apps that prevent ads making it to the screens of mobile phones topped the charts this year. What will the consequences be in 2016?

When Apple revealed that its new operating system for mobile phones, iOS 9, would feature what the company called "content-blocking Safari extensions", no one really blinked.

Tim Cook, Apple's chief executive, didn't even detail the feature on stage at the lavish launch for iOS 9 in July.