Password protect custom field types in Wordpress when visibility is set to "Password Protected"

page.php

<?php
//This function evaluates TRUE if the post is not password protected OR the correct password has been supplied.
if ( !post_password_required())
{
	//Whatever Custom Field(s) you wish to protect
	the_field("page_content");
}
else
{
	//This will call the password form -- can be customized in functions.php
	echo get_the_password_form();
}
?>