Hidden Fragment Macro is very simple macro for Confluence. Sometimes page contains information that is not intended for all users who can see the page. It may be security limitation or may just do not want to clutter up page with info that is not useful for everybody. So for these cases you can use this plugin.
Just wrap document fragment by macro and define users or groups who can see it. Please notice that person who can edit the page can always see macro body in page editor.