WP_COPYRIGHT

copyright.php

<?php
/**
 *Plugin Name: Copyright
 *Version:     0.1
 *Plugin URI:  http://argcandargv.com
 *Description:  adding link for each single post at its first
 *Author:      Yu Jing
 *Author URI:  http://argcandargv.com/about
 */

function Copyright($outer){

	if(!is_singular()){ return $outer; }
	global $post;

	$tmp = "<h4>Permalink&nbsp;&nbsp;:&nbsp;<a href='"
		. get_permalink($post->ID)."'>&nbsp;"
		. get_permalink($post->ID)."</a>&nbsp;</h4>";
 
        $outer = $tmp.$outer;        
	return $outer;
}

 add_filter('the_content', 'Copyright');
//add_filter('the_content', 'Code_Is_Life_Copyright',11);// the bigger the number is ,the latter ..

?>