Are they lying when they say ‘YouTube’s “rolling cipher” is an effective technical measure within the meaning of EU and German law, which is materially identical to Title 17 U.S.C. §1201 of the United States Code’? That seems quite plausible to me. Executing Google’s code in a regular web browser doesn’t give you a way to save an .mp4 file on your computer.
You can use Chrome's Network Tools to download the files. Hard to argue that it's effective when Google's own software can bypass it out of the box.
Just check the network tab, copy the URL and remove the range parameter. You'll get one for video and another for audio, which you can merge to recover the original file. This is effectively what youtube-dl does.
