Then I have a question I don't have answer too. I have won two or three times in competions by Photos.com in Graphics.com website. The price allowed me to download how many of their photos I wanted during a period of once 1month and twice 3 months. of course I downloaded a lot. There are no notions of any kind who the photographer is, just a number on every stockphoto.
I have understood it so that I don't have to every time I use something in a painting or a manipulation write that this I won in a competition from photos.com.
We have discussed it in 2D forum but not come to any clear result. Tne best is of course to mail photos.com and ask. When I got my price there were nothing written about copyrighr or that I should mention photos.com when I used the photos.