Index: include/locales/en_gb.inc.php
===================================================================
--- include/locales/en_gb.inc.php	(revision 18027)
+++ include/locales/en_gb.inc.php	(working copy)
@@ -294,6 +294,7 @@
 	'S_ALARM_ACKNOWLEDGES_BIG'=>		'ALARM ACKNOWLEDGES',
 	'S_ACKNOWLEDGE_ADDED'=>			'Acknowledge added',
 	'S_CANNOT_ACKNOWLEDGE_EVENT'=>		'Cannot acknowledge event',
+	'S_NO_PERMISSION_TO_ACKNOWLEDGE' => 'You cannot acknowledge',
 	'S_SYS_BULK_ACKNOWLEDGE'=>		'----[BULK ACKNOWLEDGE]----',
 	'S_BULK_ACKNOWLEDGE'=>			'Bulk acknowledge',
 	'S_ACKNOWLEDGE_DATE_FORMAT'=>		'd M Y H:i:s',
Index: acknow.php
===================================================================
--- acknow.php	(revision 18027)
+++ acknow.php	(working copy)
@@ -93,7 +93,8 @@
 			$options = array(
 				'output' => API_OUTPUT_SHORTEN,
 				'acknowledged' => 0,
-				'triggerids' => $_REQUEST['triggers']
+				'triggerids' => $_REQUEST['triggers'],
+				'editable' => 1
 			);
 			$_REQUEST['events'] = CEvent::get($options);
 		}
Index: api/classes/class.cevent.php
===================================================================
--- api/classes/class.cevent.php	(revision 18027)
+++ api/classes/class.cevent.php	(working copy)
@@ -693,7 +693,8 @@
 				'eventids' => $eventids,
 				'output' => API_OUTPUT_EXTEND,
 				'select_triggers' => API_OUTPUT_EXTEND,
-				'preservekeys' => 1
+				'preservekeys' => 1,
+				'editable' => 1
 			);
 			$allowedEvents = self::get($options);
 			foreach($eventids as $num => $eventid){
Index: tr_status.php
===================================================================
--- tr_status.php	(revision 18027)
+++ tr_status.php	(working copy)
@@ -596,7 +596,16 @@
 
 		if($config['event_ack_enable']){
 			if($trigger['event_count']){
-				$to_ack = new CCol(array(new CLink(S_ACKNOWLEDGE, 'acknow.php?triggers[]='.$trigger['triggerid'].'&backurl='.$page['file'], 'on'), ' ('.$trigger['event_count'].')'));
+				$triggerEditable = CTrigger::get(array(
+					'editable' => 1,
+					'trigegrids' => $trigger['triggerid'],
+					'output' => API_OUTPUT_SHORTEN,
+				));
+				if (!empty($triggerEditable)) {
+					$to_ack = new CCol(array(new CLink(S_ACKNOWLEDGE, 'acknow.php?triggers[]='.$trigger['triggerid'].'&backurl='.$page['file'], 'on'), ' ('.$trigger['event_count'].')'));
+				} else {
+					$to_ack = new CCol(S_NO_PERMISSION_TO_ACKNOWLEDGE, 'unknown');
+				}
 			}
 			else{
 				$to_ack = new CCol(S_ACKNOWLEDGED, 'off');