Sometimes you may want to add content to your wiki that is sensitive and you do not want to be easily copied out, or even printed. Staff.Wiki lets you do this by setting an article to "Protected". 

To make an article protected, go to the settings when editing the article, and set "Protected" to Yes (under Advanced).

Once published, a protected article will disallow casual copying of the article contents into the clipboard. It will also not allow that particular article to be printed.

Note, however, that this restriction is only superficial in order to stop ordinary users from copying the content out. Someone with deeper technical knowledge could likely find a way around the restriction.