From the announcement:
It’s a public domain celebration! The Digital Public Library of America and DigitalNZ are very excited to announce the launch of GIF IT UP, an international competition over the next six weeks to find the best GIFs reusing public domain and openly licensed digital video, images, text, and other material available via our search portals. The winners will have their work featured and celebrated online at the Public Domain Review and Smithsonian.com. Pretty sweet, huh?