A remote controlled aircraft, comprising: one or more control channel transceivers configured to exchange encrypted digital control signals with a control station, and send encrypted telemetry signals to the control station; a video camera; the remote controlled aircraft characterised in that it further comprises: circuitry configured to receive a first video signal from the video camera and perform digital processing on the first video signal; digital to analog conversion circuitry configured to convert the digitally processed first video signal to an analog video signal; one or more control circuits (441, 457) configured to: decrypt the encrypted digital control signals received through the control channel transceivers and operate the remote controlled aircraft in response to the decrypted control signals; and obfuscate the analog video signal in response to a control signal received through the control channel transceivers, including embedding information in the analog video signal for reversing the obfuscation of the analog video signal; and a video transmitter configured to receive and transmit the obfuscated analog video signal. one or more control channel transceivers configured to exchange encrypted digital control signals with a control station, and send encrypted telemetry signals to the control station; a video camera; the remote controlled aircraft characterised in that it further comprises: circuitry configured to receive a first video signal from the video camera and perform digital processing on the first video signal; digital to analog conversion circuitry configured to convert the digitally processed first video signal to an analog video signal; one or more control circuits (441, 457) configured to: decrypt the encrypted digital control signals received through the control channel transceivers and operate the remote controlled aircraft in response to the decrypted control signals; and obfuscate the analog video signal in response to a control signal received through the control channel transceivers, including embedding information in the analog video signal for reversing the obfuscation of the analog video signal; and a video transmitter configured to receive and transmit the obfuscated analog video signal. circuitry configured to receive a first video signal from the video camera and perform digital processing on the first video signal; digital to analog conversion circuitry configured to convert the digitally processed first video signal to an analog video signal; one or more control circuits (441, 457) configured to: decrypt the encrypted digital control signals received through the control channel transceivers and operate the remote controlled aircraft in response to the decrypted control signals; and obfuscate the analog video signal in response to a control signal received through the control channel transceivers, including embedding information in the analog video signal for reversing the obfuscation of the analog video signal; and decrypt the encrypted digital control signals received through the control channel transceivers and operate the remote controlled aircraft in response to the decrypted control signals; and obfuscate the analog video signal in response to a control signal received through the control channel transceivers, including embedding information in the analog video signal for reversing the obfuscation of the analog video signal; and a video transmitter configured to receive and transmit the obfuscated analog video signal.