I have a list with 50 items. I don't want to change users' permissions to the list itself, but I do want to restrict their access to the 50 items created so far.
When I select all the items together, ITEM PERMISSIONS is greyed out in the toolbar, but I can do them one at a time.
Is there an way to change permissions for all items in a list at once?
Using either the ribbon, a workflow, PowerShell, or the Client Object Model?