There is ZERO caching of YT content. Every single vidoe/audio source link your client receives is individually cryptographically signed for you (IP) and for thi

There is ZERO caching of YT content. Every single vidoe/audio source link your client receives is individually cryptographically signed for you (IP) and for this particular time (timestamp, expires in couple hours). Refresh the page and you receive brand new list of different links to same files.