Finally, a demo of how you might implement feature locking into your application has been released by SKGL project December 28, 2012. This tutorial consist of a video, a demo website, http://dtc.clizware.net/Home.aspx, and source code, http://skgl.codeplex.com/releases/view/99637. Below, some screenshots:

The application

dtc2dtc1

The website

dtc3

The video