Explanation

*Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use. No copyright infringement intended. ALL RIGHTS BELONG TO THEIR RESPECTIVE OWNERS*
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Creative Commons
Creative Commons licenses provide a standard way for content creators to grant someone else permission to use their work. YouTube allows creators to mark their videos with a Creative Commons CC BY license.

If you’ve marked your video with a CC BY license, you retain your copyright and other creators get to reuse your work subject to the terms of the license.

Creative Commons on YouTube
The ability to mark uploaded videos with a Creative Commons license is available to all creators.

The standard YouTube license remains the default setting for all uploads. To review the terms of the standard YouTube license, please refer to our Terms of Service.

Because Creative Commons licenses are for your original content, you cannot mark your video with the Creative Commons license if there’s a Content ID claim on it.

By marking your original video with a Creative Commons license, you’re granting the entire YouTube community the right to reuse and edit that video.
License
Creative Commons Attribution license (reuse allowed)