One of the article that was once front page of HN https://medium.com/@pixelmagazine/where-are-chernobyl-s-children-a-photojournalist-s-honest-project-in-the-age-of-disaster-tourism-4cd333ab80c7 was taken down in 48 hours by a DCMA notice from National Geographic, clamming "The license for Gerd's two images does not permit use on the publishing platform Medium, and was not part of our negotiation or contract. ", although we purchased proper license for "One-time, Non-exclusive rights to use image within the Gerd Ludwig interview piece for Pixel Magazine online blog.". We spend lots of energy conducting interview and writing the article. What should we do?