keys to the workplace, you can arrange with the usb token or scanners of fingerprints (and it's inexpensive by the way).
Below information could not be taken out of the building. So that it was impossible to send on soap, made with the help of firewall. It is necessary to add to this hardware component.
uh? the barrier? a guard with a cudgel? in fact only one method — to close all external channels in General, and plant n-Noe number of security-paranoid, a sort of big brother watching over all
actions of employees. this way the money will cost, and contrary to the Labor code in most cases.
otherwise it is possible with a relatively small budget and technical knowledge to "make" anything.
in get requests, DNS queries, steganography in the Fax, the background "noise" during a telephone conversation, and a laser transmitter through a window in the end.