Polyvore.com allows users to swipe copywritten material from anywhere on the web and import it onto the site and then create collages or "sets" from imported images. Polyvore supplies the graphics application which can be used to create derivative works and remove watermarks and copyright information from imported images.
More often than not these images are not credited back to the original creator and in nearly every instance images are swiped without the express permission of their creators.
Here, http://www.flickr.com/photos/8504507N02/3172837696/page2/ Pasha Sadri, owner of the Polyvore website, admits in a response to an artist whose original artwork was stolen and manipulated using Polyvore's graphics application to make illegal derivatives, "polyvore is meant to be a fashion website. people clip product images (from a site like gap.com) and use the images to create fashion layouts. that is why we have the clipping tool. we potentially earn money if someone goes from polyvore t