Thread: What does this mean? (header("Cache-control: private");)

What does this mean? (header("Cache-control: private");)

Warning: Cannot modify header information - headers already sent by (output started at /home/creative/public_html/cuisinecard.co.uk/wp-content/themes/classipress/includes/theme-footer.php:1) in /home/creative/public_html/cuisinecard.co.uk/wp-content/themes/classipress/tpl-add-new.php on line 17

I've downloaded and looked at tpl-add-new.php and on line 17 we have..

header("Cache-control: private");

I got the error at the top when I removed the following code from theme-footer.php..

<div class="right">
<p><a target="_blank" href="http://www.appthemes.com/themes/classipress/" title="Classified Ads Software"><?php _e('Classified Ads Software','appthemes'); ?></a> | <?php _e('Powered by','appthemes'); ?> <a target="_blank" href="http://wordpress.org/" title="WordPress">WordPress</a></p>
</div>


I deleted it all, uploaded it and the if you visit: http://www.cuisinecard.co.uk/add-new you'll see it at the top.