Newly Declassified Window Film Keeps Out Hackers, Phone Calls, EMPs

Once manufactured under an exclusive contract with the US government, the recently declassified window film is now available to the public. Currently, Signal Defense Film is only available directly from the manufacturer, CPFilms, at prices that will likely make it prohibitive for all but the wealthiest home owners. The coating, which in its thinnest incarnation is only two one thousandths of an inch thick, can block Wi-Fi signals, mobile phone transmissions, even the near-infrared, yet is almost transparent, making it no more intrusive than conventional window treatments. It can keep signals in (preventing attempts to spy on electronic communications) or out, minimising radio interference and even the fabled electronics-destroying electromagnetic pulse (EMP) generated by a nuclear blast