Password protection in template

Hi,
I’m now searching for a long time and I find no solution. I protected a page with a password. But the page is displayed normally.
I think some lookup for the password protection is missing in my template.
I#M using a plugin to display the content. The help pages for including the protection tags does not help me.
The content is displayed like this:

<?php
/*
Template Name: tplWish
*/

$page_url = get_pagenum_link();
$category = substr($page_url, strrpos(substr($page_url, 1, -1), "/") + 2, -1);

$sellFormat = "
<div class='blogbefore'></div>
<div class='blog'>
  <h3>%post_title%</h3>
  %post_content%
</div>
<div class='blogafter'></div>
";

?>

<?php get_header(); ?>

<div id="menucontainer">
<?php if (function_exists('dynamic_sidebar')) : ?>
  <?php dynamic_sidebar('normal'); ?>
<?php endif; ?>
</div>

<div id="contentcontainer">
    <?php c2c_get_recent_posts( 50, $sellFormat, '4', 'excerpt', 'ASC'); ?>
</div>

<?php get_footer(); ?>

Can anyone please help me to protect my code?
I also tried many plugins but no one works.
Thanks in advance
Chris