If a gold lock appears above the screen, it means this page has been put under full protection until further notice because of excessive vandalism or edit wars. It can be taken down only by authorized administrators, those who choose to take it down before accepted will be blocked for all levels
If there is a red lock on the screen, it means that the page is under total protection indefinitely, it is for only administrators to access & locks down the page of editing, anyone who is to remove this lock would be blocked for all levels. This lock however, doesn't mean the page is move protected, it must be paired with a green lock, just like the gold & silver locks.
If there is a green lock posted, no one except for administrators, can move or redirect the page, anyone caught in the act of doing so would be blocked