Nice Wallpaper. I am planning to create a Tribal Designs Theme for Windows 7. Planning to include this wallpaper in the theme. Theme is available for download free of cost from my blog. Credits are given here on DA in the deviation details as well as in a text file with the theme. Hope that is ok with you.
Looks like they didn't bother to do much, just slap it up there. I suppose you have to keep in mond they might not have intended to redistribute it there, they might have just wanted to store it there to save room on their computers or to make a thumbnail. Should message them first before jumping to any serious conclusions.