private function getAccessRights(\Category $category, \DmsLoaderParams $params)
  {
    $objAccessRight = $this->Database->prepare("SELECT * FROM tl_dms_access_rights WHERE pid = ?")
                     ->execute($category->id);
    $arrAccessRights = array();
    while ($objAccessRight->next())
    {
      $accessRight = $this->buildAccessRight($objAccessRight);
      $accessRight->category = $category;
      $arrAccessRights[$accessRight->id] = $accessRight;
    }
    return $arrAccessRights;
  }