In case you ever publish posts that are private, you’ll notice that the title is prefaced by an unsightly reminder. You can add the code below to your functions file and everything will look good again.

function the_title_trim($title) {

$title = attribute_escape($title);

$findthese = array(
'#Protected:#',
'#Private:#'
);

$replacewith = array(
'', // What to replace "Protected:" with
'' // What to replace "Private:" with
);

$title = preg_replace($findthese, $replacewith, $title);
return $title;
}
add_filter('the_title', 'the_title_trim');