title: How do I make a list item read-only
body: <p>I have a list (assume an issues list) and there is a workflow associated with it. The workflow can adjust the status column of the item to "Closed". Once an item's status is closed, I want to make it read-only so that noone can edit the item or create another workflow instance for that item.</p>
  
  <p>What's the best way to achieve this?</p>