Here someone asked if it's possible to contribute subtitles to a YouTube video. I know that it's possible because I contributed Italian subtitles for this video (because there is an option to do that).
The following screenshot shows the option:
Clicking that brings me to this page.
Why can't I find that option on every video?
Is it something that uploaders must explicitly enable?
Are there some legal issues?
Best Answer
Only some channels allow users to contribute subtitles.
From Contribute subtitles and closed captions - Youtube Help