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How do we protect our files from being accessed outside our network?

How do we protect our files from being accessed outside our network? For example, if a staff member is trying to copy a C++ file and open at his/her home pc, we'd like the file to become rubbish. How could we do that and is it practical? Encryption won't work because it will require the user to encrypt him/herself and that's unlikely.
One approach is to simply restrict part of your network. Divide your network into two separate areas. The first area is accessible to individuals from outside your network. It should not contain any critical information. This area is called the DMZ. The second area is your internal network. It is not accessible by anyone from the Internet.
This was last published in August 2003

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