
I had a short contract with Apple a few years ago to teach them how to use Linux so they could run an internal database on it. During the tour of their facilities on the first day they took great pains to show me the door I wasn't at all interested in and would never have noticed behind which all their super secret highly advanced don't leak them to the press but aren't we cool for having such amazing secrets were being developed.
They also in the second week patched over the glass surrounding their "manufacturing" facility with frosting at eye height so that contractors such as myself couldn't accidentally see in. Couldn't see in to the room I had to go in every day to reach the servers I was building.
Secrets stolen from Apple? Colour me shocked.