Like many librarians I often turn to Creative Commons licensed photos on Flickr for use in my presentations and blog posts. Flickr makes it incredibly easy to search for photos with a Creative Commons license. Unfortunately it also makes it ridiculously easy for users to change the license on all their photos at any time with the click of a button. There is no way to prove the license at the time of use. I have been slowly weaning myself away from Flickr photos instead taking my own or sometimes paying for them.