A wide variety of video material distributed by the Chaos Computer Club. This feed contains all events from 33c3 as mp3
https://media.ccc.de/c/33c3
Everything you always wanted to know about Certificate Transparency (33c3)
Certificate transparency - what is it, and what can be done with it? about this event: https://fahrplan.events.ccc.de/congress/2016/Fahrplan/events/8167.html