Anti-obesity campaigners in Mexico, human rights advocates in London, and friends of the murdered journalist Jamal Khashoggi all claim they’ve been targeted by surveillance software normally used by law enforcement to track drug-dealers and terrorists.

File on 4 reveals compelling evidence that software is being used to track the work of journalists, activists and lawyers around the world. Paul Kenyon investigates the multi-billion pound ‘lawful surveillance’ industry. Sophisticated software can allow hackers to remotely install spyware on their targets’ phones. This gives them access to everything on the devices – including encrypted messages – and even allows them to control the microphone and camera.

So what are the options for those who are targeted and is there any way to control the development and use of commercially available software?

Presenter: Paul Kenyon

Photo credit; Valery Brozhinsky\Getty