Once a bit of a fringe cause, labelling online images for re-use and sharing (see Creative Commons) has gained some high-level impetus in recent years. Major art galleries and museums around the world have been releasing millions of images and encouraging audience engagement. Amsterdam's Rijksmuseum actually encourages users to re-mix and alter their high resolution artworks. Google's "Art Project" aggregates high resolution images of great art from many of the world's leading institutions. The common creative heritage of humanity, made accessible for anyone with an internet connection...