diff --git a/seminar/views/views_all.py b/seminar/views/views_all.py
index 316211fd..a550c40a 100644
--- a/seminar/views/views_all.py
+++ b/seminar/views/views_all.py
@@ -127,6 +127,7 @@ class TNLData(object):
 	def from_treenode(cls,anode,parent=None,index=None):
 		out = cls(anode,parent,index)
 		for (idx,ch) in enumerate(treelib.all_children(anode)):
+			# FIXME přidat filtrování na veřejnost
 			outitem = cls.from_treenode(ch,out,idx)
 			out.children.append(outitem)
 		out.add_edit_options()
diff --git a/seminar/viewsets.py b/seminar/viewsets.py
index 57dac391..cc59f7d7 100644
--- a/seminar/viewsets.py
+++ b/seminar/viewsets.py
@@ -18,12 +18,30 @@ class PermissionMixin(object):
 		# návštěvník nemusí být zalogován, aby si prohlížel obsah
 		return [permission() for permission in permission_classes]
 
-	def has_object_permission(self, request, view, obj):
-		if obj.verejne:
-	    		return True
-		else:
-			return False
+	def verejne_nad(self, node):
+		""" Returns output of verejne for closest Rocnik, Cislo or Problem above.
+		(All of them have method verejne.)"""
+		parent = get_parent(node)
+		while True:
+			rocnik = isinstance(parent, RocnikNode)
+			cislo = isinstance(parent, CisloNode)
+			problem = isinstance(parent, ProblemNode)
+
+			if (rocnik or cislo or problem):
+				break
+			else:
+				parent = get_parent(parent)
+		if rocnik:
+			return parent.rocnik.verejne()
+		elif cislo:
+			return parent.cislo.verejne()
+		elif problem:
+			return parent.problem.verjne()
 
+	def has_object_permission(self, request, view, obj):
+		# test that obj is Node
+		assert isinstance(obj, Node)
+		return verejne_nad(node)
 
 class ReadWriteSerializerMixin(object):
 	"""