user24405: According to YouTube help center, Creative Commons licensed videos can be reused and edit. 
But it is not allowed to download videos from YouTube, so how can i edit it?
YouTube Studio beta only allows to edit your uploaded videos.

user456: As Dr Mayhem mentioned, if you can see it and it has an appropriate license, you are allowed to reuse it.
I would recommend also as they suggested to ask the author first if they can send you a copy somehow. Alternately, I think youtube-dl should have you covered for downloading directly. It's a command-line tool so you will have to use the shell of your OS (e.g. Command Prompt in Windows) to use it, but it's fairly easy to use and has a plethora of options for getting the exact quality you require. Generally you can probably get by with just calling it without any parameters e.g.:

youtube-dl www.youtube.com/watch?v=xxxxxx


24405: <p>According to <a href="https://support.google.com/youtube/answer/2797468?hl=en" rel="nofollow noreferrer">YouTube help center</a>, Creative Commons licensed videos can be reused and edit. 
But it is not allowed to download videos from YouTube, so how can i edit it?</p>

<p>YouTube Studio beta only allows to edit your uploaded videos.</p>
 456: <p>As Dr Mayhem mentioned, if you can see it and it has an appropriate license, you are allowed to reuse it.</p>

<p>I would recommend also as they suggested to ask the author first if they can send you a copy somehow. Alternately, I think <a href="https://youtube-dl.org/" rel="nofollow noreferrer">youtube-dl</a> should have you covered for downloading directly. It's a command-line tool so you will have to use the shell of your OS (e.g. Command Prompt in Windows) to use it, but it's fairly easy to use and has a plethora of options for getting the exact quality you require. Generally you can probably get by with just calling it without any parameters e.g.:</p>

<blockquote>
  <p>youtube-dl www.youtube.com/watch?v=xxxxxx</p>
</blockquote>
