Yes, by injecting my own userscript using my (judging by WEI not for long) USER AGENT. I dont even screw around reimplementing their signature/n decoding/throttling functions, I grep for player.js match(/(?:player\/([a-zA-Z0-9_-]+)\/)?(?:html5player|(?:www|player(?:_ias)?))[-\.]([^/]+?)(?:(?:\/html5player(?:-new)?)?|(?:\/[a-z]{2,3}_[A-Z]{2})?\/base)\.js/), then grep in that for relevant functions and call those directly. You could say that from YT perspective everything is 100% kosher, its their own DRM functions unlocking .mp4 link for me :)