What this means is that you cannot take anyone's art and use it (without permission) . . but you can recreate it yourself and upload it (until and if they request you, WinCustomize, or Stardock to take it down).
Thanks Zubaz, was also thinking on the same i,e recreation 
Amit, I created a dream from their wallpaper a couple of years ago for my son (we both have Razor Lachesis mice) and was unable to obtain their permission to use their images, so I was not able to distribute it to the public.
You may have better luck than I did.
I believe since you created the dream for your son and personal use, you had used the image from their wall !!
If you would've created it from scratch, you would'nt need any permission until asked for !! 