Вот что они сами сообщают в переписке:
Dear artist, if you have your artworks uploaded on Fotolia or 123RF, they will automatically show up on our site as a digital image. It is a great opportunity for your artworks to be promoted worldwide as we sell in Europe, United States, Canada and South America. Everytime your artwork is selected by our customer, you can check it out on your Fotolia or 123RF account and smile when you discover we earn money for you.
Правда, совсем непонятно по какой лицензии они печатают. Но это, наверное, в fotolia можно уточнить.