This is unbelievable to me.
I discovered it this evening and learned it was only added in the last week.
It looks like YT (Google) is getting set to allow anyone to use snippets of our copyrighted material.
I unchecked it and save the change.
Then went to my next video.... unchecked and saved again.
It seems they are on all my recent videos. This was not there when I uploaded all but this evenings offering.
However..... there is no way possible (unless I missed something) to turn off this option in bulk across your channel.
You must access each video's editing page,
scroll down to the bottom,
Select "more" or "show more"
Then scroll towards the bottom again to find it.
In fact.... It is activated on all of my 1,077 videos all the way back to 2006!
Here is a snip off my first Youtube video (2006) editing page.
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I looked around and found this video talking about the issue.