I just signed up with youtube and put up a few videos. (Under a CC BY-SA license.)
I searched for copyleft to see what other copyleft works were on there and found a lot of works tagged or otherwise marked as copyleft but with explanations indicating that they were not actually copyleft.
I am going to try and document Free, Open, and Copyleft confusions as I find them out in the wild. I invite you to join in if you wish.
Found with a copyleft search on youtube but this is not copyleft:
Copyleft - Creative Commons Deed:
The NC here makes this not copyleft.
"Multiracial Alliance Building Peace Conference and is 100% copyleft and
non-copyrighted so we encourage people to duplicate it and circulate it around
Claims to be copyleft and non-copyrighted at the same time. If it is public domain, it can't be copyleft. What is really meant?
"Cin Cin Man" was COPYRIGHTED and promptly COPYLEFTED (anybody is free to use it, improve, change, mutilate, but with NO commercial purposes/ www.creativecommons.org).
No commercial purposes means this is not copyleft.