Tracking back the links and quotes, I came to this page on the School Library Journal, with a commentary about this video written by Kathy Ishizuka
"Copyright law is complex enough—throw in an instance of international remixing by young nerdfighters, and you have a real mess. But in the hands of author John Green, it’s the basis for a pretty cool video.
In the three-minute clip..., Green recounts his attempt to discern the provenance of a poster (pictured) based on characters from his novel The Fault in Our Stars, revealing the complexities of copyright in the digital age along the way."
This is the poster Green talks about in the video: