WiFi: Free Ride No More

Are the days of free riding open WiFi networks numbered? The Register reports on tunable surfaces, which can selectively block WiFi signals from getting out into the open:

Dr Christos Mias, in the University of Warwick's School of Engineering, has developed a "dipole grid-based frequency selective surface" to perform this task. This grid of circuitry has the potential to be embedded in any glass window and then tuned to block the selected frequency. The circuit can easily be tuned to block a different frequency if circumstances in the office change without having to remove the window or the circuits.

I guess the tuner to tune these windows has some encryption running. And I pithy the future office workers on a steaming hot summer day in 2025 that are caged behind WiFi windows when the airco breaks down. They'll probably cool down from the coolness of this device.