"In 2008, the Massachusetts Bay Transportation Authority (MBTA) obtained a temporary restraining order to prevent a talk at DEFCON by three MIT students who had uncovered physical and logical security holes in MBTA infrastructure."
I mean, the IOS guy worked for IOS, so he was divulging information that Cisco paid him to obtain. HBGary paid Aaron Barr to research anonymous, so they have a case for him doing the same thing. However, what kind of case could MBTA possibly have against some kids who found problems with their infrastructure? I fail how to see how such an injunction was anything but unconstitutional.