protected function _listACLRights(Horde_Imap_Client_Mailbox $mailbox, $identifier)
{
$resp = $this->_sendCmd($this->_command('LISTRIGHTS')->add(array($this->_getMboxFormatOb($mailbox), new Horde_Imap_Client_Data_Format_Astring($identifier))));
return isset($resp->data['listaclrights']) ? $resp->data['listaclrights'] : new Horde_Imap_Client_Data_AclRights();
}