title: Stop all logged in users from being able to edit all content
body: <p>I have noticed that a user who is logged in (who is not part of any group) can edit any item in my site. I would like to take advantage of the sharing functionality, and specify who can edit the content, but it seems to have no effect, since all logged in users can edit everything (and seem to be able to change permissions themselves). How can I make the site pay attention to the sharing settings?</p>
  
  <p>I cant seem to find any documentation which describes this default behaviour making me wonder if it is just my setup. </p>