So, we have the worksets of the linked models (both the instance and the definition of the link are in these worksets) editable by a certain user, so that prevents the typical user from moving or deleting any of the links. But, all it takes is somebody opening two local files of any of the models that are linked together, (so they can copy and paste stuff between them) and that person not being wise enough to not press OK when Revit says it has to unload that link in the current file, and the link is unloaded for everybody. Anybody have a way of locking it up so that links cannot be unloaded?