This widget is used by http://kudobox.co to create awesome-looking cards. To understand how to use it, check http://kudobox.co/api
You can freely use Kudobox Builder Widget together with Kudobox API or without it. However, it is prohibited to use provided kudo cards' templates without Kudobox API.
These kudo cards are property of Jurgen Appelo and could be used exclusively with his permission.