wpmem_securify

add_filter( 'wpmem_securify', 'my_securify_filter' );

function my_securify_filter( $content ) {

    /*
     * This can filter the content that is returned.
     * 
     * If you have additional criteria you want to set to 
     * block content, such as a custom post type, or a user 
     * level, this is the filter you want to use. In that 
     * case, return an error message (or other content) if 
     * additional criteria are not met.
     */
    
     return $content;
}