Restrict modification to Log View

Hi all,

We have several external users in our Unifier environment whom we allow to see same BPs as we do. Recently, we've been having needs to not allowing some records to be seen by the external users. I could only think of modifying the existing "All Records" view to filter out those records that we don't want the external users to see. However, with the current design, any user can still access the "Modify View" and may find that we apply a filter for the view, which they can simply deactivate to see records that I filtered out.

Does anyone know of a way to restrict modification to Log Views ? Any other ideas to resolve the above case are also very welcomed.