If you are authoritarian or complicit in a situation where your technology is used to increase power and authoritarianism, you should be wary of a new tech firm in London called Clearview AI.

The tech firm's founder is director Sam Kuczpa, formerly the executive director of think tank, the Institute for War and Peace Reporting, and has also founded World Access Inc. and Expect Further.

In an interview with the BBC, Kuczpa said he had visited as many as 40 countries, using the firm's free facial recognition software to verify people's identities to let them in.

But while he claims people who have feared governments or insurgents would use the services, there have been no cases, and the technology is also being sold to the UK government.

"At times people have been reluctant to give us any information, but we've never had any attacks where anyone's fears have been realised."

He suggested China, Myanmar and Morocco are among the places he has considered bringing the software.

Kuczpa said governments that invested in the technology would get it for free and the firm was looking to monetise the service.

"I know of a market that would buy very cheaply for financial gain, looking to make more off of it."

The technology has also been used by firms in Belgium, Uganda and the Philippines, who are providing security services to the governments.

A Ugandan police unit uses the system to identify suspects for off-the-books arrests.

For security services around the world, an ageing infrastructure makes it difficult to find, access and maintain the digital evidence they need.

Kuczpa sees applications for his technology in the health care sector as well.