This quiz access rule was created by Tim Hunt at the Open University. It provides Safe Exam Browser 2.0 integration for Moodle. It can be used with versions 2.3.7 of Moodle, or later. (For Moodle 2.4, you should be using 2.4.4 or later.)
If you install this plugin, there is a new option 'Allowed browser exam keys' on the quiz settings form where you can enter valid keys for version of SEB that should be allowed to attempt the quiz. There is also a new capability 'Not required to use Safe Exam Browser'. Users with that capability (by default teachers and above) are exempt from the secure browser check.