diff --git a/security/common.py b/security/common.py
index 615496c..fbb6a16 100644
--- a/security/common.py
+++ b/security/common.py
@@ -189,6 +189,7 @@ class WorkspaceInformation(Persistent):
     __name__ = u'workspace_information'
 
     propagateRolePermissions = 'workspace'
+    propagateParentSecurity = False
     allocationPredicateNames = allocationPredicateNames
     workspaceGroupsFolderName = workspaceGroupsFolderName
 
diff --git a/security/interfaces.py b/security/interfaces.py
index 5b325f9..ef4876e 100644
--- a/security/interfaces.py
+++ b/security/interfaces.py
@@ -73,3 +73,6 @@ class IWorkspaceInformation(Interface):
     propagateRolePermissions = Attribute('Whose role permissions should be '
                     'propagated to children (workspace_informaton or parent)?')
 
+    propagateParentSecurity = Attribute('Should the security settings of '
+                    'the workspace parent be propagated to children?')
+
diff --git a/security/setter.py b/security/setter.py
index 74d67bc..2992f88 100644
--- a/security/setter.py
+++ b/security/setter.py
@@ -151,9 +151,11 @@ class ConceptSecuritySetter(LoopsObjectSecuritySetter):
         setter = ISecuritySetter(adapted(relation.second))
         setter.setDefaultRolePermissions()
         setter.acquireRolePermissions()
-        setter.copyPrincipalRoles(self, revert)
         wi = baseObject(self.context).workspaceInformation
-        if wi:
+        if wi and not wi.propagateParentSecurity:
+             return
+        setter.copyPrincipalRoles(self, revert)
+        if wi: 
             setter.copyPrincipalRoles(ISecuritySetter(wi), revert)
         setter.propagateSecurity(revert, updated)