You are absolutely right about MIT developed this EyeRing finger-mounted camera. Although it is not working fully stable right now, I guess brainy guys from MIT will finish it out and make it work perfectly, so your worries are quite reasonable.
EyeRing finger-mounted camera is a small device that is held on the finger as a ring. It can take pictures of different signs and money for example (in fact, the original purpose of this device is to help visually impaired people to better interact with this world). After taking a picture EyeRing sends it to the Bluetooth-connected device like your smartphone or tablet, where special app processes the image and reads the text from it aloud.
Still I guess there is a way for people interested in the documents from your office to use this device to save those pictures and study them later, thus you need to prevent EyeRing finger-mounted camera from sending pictures and avoid business intelligence in that way.
answered May 16 '12 at 05:35