The video for module 2 seems to be missing. Here is a similar talk that is about the same length on the exact same topic (survey/overview of of HDC/VSA) by the same person (Denis Kleyko): <a href="https://www.youtube.com/watch?v=3EOJrDD1bMs" rel="nofollow">https://www.youtube.com/watch?v=3EOJrDD1bMs</a>