This master’s thesis addresses the critical need to counter unauthorized video recordings in sensitive environments by developing and validating an experimental system for blocking illicit recordings in real-time. The proliferation of recording devices like smartphones and wearables, while technologically advanced, poses significant challenges to privacy, intellectual property, and physical security in settings such as research laboratories, government facilities, operating rooms, military zones, and strategic meetings. Traditional security measures are often insufficient due to the miniature size of modern cameras. This work proposes BATGuard: a solution using ultrasound to interfere with the internal stabilization mechanisms of consumer recording devices and, ultimately, to degrade their video recording capabilities.