For these CCC videos, please link to media.ccc.de. They built a media distribution platform for us that gives higher quality, allows downloads, and uses no tracking. Why not use it?
I'm in Stralsund and it straight-up won't play the video in Chrome. Just keeps spinning. Downloading from youtube works as well, even though you have to resort to youtube-dl, and i like having youtube track what i've seen so i can refer to that later in case i forget having seen something. Plus, the CCC org is not any more trustable than youtube.
In the developer tools console there is a mixed content warning:
Mixed Content: The page at 'https://media.ccc.de/v/32c3-7435-replication_prohibited#video' was loaded over HTTPS, but requested an insecure video 'http://ftp.halifax.rwth-aachen.de/ccc/congress/2015/h264-hd-web/32c3-7435-en-Replication_Prohibited.mp4'. This content should also be served over HTTPS.
The CCC built a distributed CDN, so nope, that wouldn't help: my video is loading from netcologne.de, for instance (in a 'video' element, which is appreciate, from my point of view).
https://media.ccc.de/v/32c3-7435-replication_prohibited#vide...