“Twenty Years of Creative Commons (in Sixty Seconds)” by Ryan Junell (junell.net/) and Glenn Otis Brown (linkedin.com/in/gotisbrown/) for Creative Commons (creativecommons.org/) is licensed via CC BY 4.0 (creativecommons.org/licenses/by/4.0/) and includes adaptations of many open and public domain works. See the same video shared on Flickr (flickr.com/photos/creativecommons/52543574218/) for a complete list of attributions.
