restricted areas no longer restricted.

Um I have noticed that some people are saying that in oder to make agents not come after you is to find keys? and tag something or other and that will give you the clearance that you need what are these people talking about and where to ge these keys and use them at I'm a hair confused if your talking about tagging or tapping data node I've tried several times and it just keeps telling me I've faild to tap a data node so I gave up.  a little insight would be nice thanks in advance.