I made a tool that can "encrypt" the videos and mess the sound, and an extension that allow you to watch this kind of videos right on YouTube.

Here is a Hentai uploaded on that platform:
https://www.youtube.com/watch?v=0jA-hZQj3UY

And a source code:
https://github.com/alex-suspicious/UnsafeYT

It's not perfect, but I gonna maintain it, aand it's published under the GPLv3 licence :)
Let it burn!