https://creativecommons.org/licenses/by/3.0CC BY 3.0 Creative Commons Attribution 3.0 truetrue
This file, which was originally posted to (Time: 11m22s) YouTube, was reviewed on 8 October 2021 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.
This file was manually reviewed by reviewerShizhao, who confirmed that this file is allowed on Wikimedia Commons.