They have extraordinary controls on what goes in and out of the network and what goes in and out of the building. They will usually decrypt all outbound communication to look for leaked code, search people on the way out of the buildings, restrict access to USB ports on computers, ‘air gap’ certain computers, etc etc. It isn’t all that easy to sneak information out of those networks and for good reason. That practically indecipherable code is what pays everyone’s checks.
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