It's in /include/languages/english/index.lang.php
PHP Code:
'diclaimermessage'=>'None of the files shown here are actually hosted on this server. The links are provided solely by this site\'s users. The administrator of this site ({1}) cannot be held responsible for what its users post, or any other actions of its users. You may not use this site ({1}) to distribute or download any material when you do not have the legal rights to do so. It is your own responsibility to adhere to these terms.',