Optic Nerve: millions of Yahoo webcam images intercepted by GCHQ | World news | The Guardian: Yahoo reacted furiously to the webcam interception when approached by the Guardian. The company denied any prior knowledge of the program, accusing the agencies of "a whole new level of violation of our users' privacy".
GCHQ does not have the technical means to make sure no images of UK or US citizens are collected and stored by the system, and there are no restrictions under UK law to prevent Americans' images being accessed by British analysts without an individual warrant.
The documents also chronicle GCHQ's sustained struggle to keep the large store of sexually explicit imagery collected by Optic Nerve away from the eyes of its staff, though there is little discussion about the privacy implications of storing this material in the first place.