" We’ve been proud to support Creative Commons licenses since 2004, and we’ve become an important repository of U.S. Government works and historic images from galleries, libraries, archives, and museums around the world (check out The Flickr Commons for examples).
But we’ve heard from our community that we’re missing two important designations: Public Domain and Creative Commons 0 (CC0). Many members of our community want to be able to upload images that are no longer protected by copyright and correctly tag them as being in the Public Domain, or they want to release their copyright entirely under CC0.
So, starting today we’re happy to support these two new options. One of the first accounts on Flickr to change its designation was SpaceX, which has uploaded more than a hundred gorgeous images of its launches. These extraordinary photos are now available for others to freely use, enhance, and promulgate without restriction under copyright law. "