Cape Productions, a Redwood City, California-based start-up, plans to tell customers on Wednesday in the US that it will stop selling software compatible with Chinese drones to its clients, most of whom use the tools to remotely dispatch and operate the small aerial vehicles to surveil possible incidents or crime scenes.

It marks a blow to China’s DJI, the world’s top maker of drones, that has spent years trying to calm fears that its products could be used for espionage.