static public function disable($license) {
        global $DB, $CFG;
        // Site default license cannot be disabled!
        if ($license == $CFG->sitedefaultlicense) {
            print_error('error');
        }
        if ($license = self::get_license_by_shortname($license)) {
            $license->enabled = 0;
            $DB->update_record('license', $license);
        }
        self::set_active_licenses();
        return true;
    }