Youtube generates revenue from user ad views, and it’s logical for the platform to implement restrictions to prevent people from downloading videos or even watching them on an unofficial client like YouTube Vanced. In this article, I will explain the technical details of these security mechanisms and how it’s possible to bypass them.
Since mid-2021, YouTube has included the query parameter
base.js, which is distributed with the web page. YouTube utilizes this parameter as a challenge to verify that the download originates from an “official” client. If the challenge is not resolved and
n is not transformed correctly, YouTube will silently apply throttling to the video download.
n parameter to it.