Seems to me that these countermeasure systems would not come without legal peril here in the US. In the first video, someone is hijacking the wifi connection of the drone - which could be considered contrary to FCC regulations as well as Federal Law (unauthorized connection to a computer system). Now, if the FAA is prepared to more conclusively declare that sUAS systems are aircraft for purposes of law, then you can add in violations of FAA regulations regarding takeover of aircraft or interfering with the PIC, etc.. It will be interesting to see how this shakes out. Also, what of the liability of taking over a drone, doing it badly, and crashing into something or someone?
That being said, does anyone know in what manner stick input is communicated to a Phantom? Obviously it's Wifi on 2.4 or 5.8Ghz from the phone/tablet to the controller, but what about controller to drone, and video versus controls?