An anonymous reader writes At the non-profit where I work, there isn't a lot of money for buying stock photos or licensing professional images. So, we've turned to sources of 'free' imagery, notably Creative Commons-licensed photos on Flickr. While we're not a huge organization, we do have 100+ individuals creating content in one way or another. We're now wrestling with compliance of the CC licensing, like including links for By Attribution images, etc. Our legal counsel is also scared of photographers changing their licenses and suing us after the fact. How do you document the images you find were licensed one way in the past, especially when numerous people from across the country are acquiring the images?