You might be able to change (remove) that link via editing language files.
Not sure which php file, however.
When fgreping for 'safeexam" files in /moodlecode/lang/en/ (if your site has different language settings you will see other subdirectories indicating that language) that found only one reference for that term 'safeexam':
Kens-MacBook-Pro:en ktask$ fgrep safeexam *.php
admin.php:$string['configenablesafebrowserintegration'] = 'This adds the choice \'Require Safe Exam Browser\' to the \'Browser security\' field on the quiz settings form. See http://www.safeexambrowser.org/ for more information.';
The download URL, BTW, takes one to a 404 page ... not found.
'spirit of sharing', Ken