Last night, CNN published an article in which they describe a scene which hopefully will never take place like this at your offices or homes: The U.S. president, his aides and Mr. Abe from Japan sitting in the dark over classified documents in a candlelit room, pointing their cameras at the papers which, directly or indirectly, describe the U.S. surveillance capabilities of the Chinese Sea for providing enough light to read them.
What could possibly go wrong?
The answer to this question: Everything. XKeyscore's existence has been proven, and there are other governments out there with similar technology, especially in Eastern Asia.
Don't try this at home, or at your offices. Always make sure that classified information stays confidential.
I have seen companies which accidentally broadcasted internal information on television, just because they forgot to clean their whiteboards before they let a camera team do their filming.
Clean up your desks when you leave the office.
Lock your PC's screen when you leave your desks.
You would never leave your car keys in your car unattended while parking on the street, going shopping or only paying the gas bill within the gas station, right? So don't do this with your workstation and your paperwork either. You can always replace a stolen car, but not your career, or the future of your co-workers. And keep your smartphones away from any confidential information, the entire phones, not just the cameras. It will also have the benefit that no ringing phone will disturb your meetings and conferences.