You can remove these items by modifying the skins file of your MediaWiki. The default skin's file isskins/MonoBook.php.
Open the file with a text editor and find this section:
// Generate additional footer links
$footerlinks = array(
'lastmod', 'viewcount', 'numberofwatchingusers', 'credits', 'copyright',
'privacy', 'about', 'disclaimer', 'tagline',
The items in the array represent the footer links in your MediaWiki. If you wish to remove a certain item from your footer, you should delete its entry from the array.
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