*Downloading stuff from the freestuff section is different, they are not images and the fact that there is a download link is sufficient permission to download it.  Also any readmes with the download explain explicitly (or should anyway) what can or cannot be done with whatever it is you've downloaded.

*That implies (especially the bit about the readme files) that the owners of the freestuff somehow get to interpret copyright law to suit themselves, which is completely absurd.   That may well be the way things work on Renderosity, but I doubt if it stands up in law.   I fail to see how someone, including me, can hope to pursue a copyright claim against an internet user for doing no more than downloading a copy of an image.   Fine:  having downloaded the said image, you may not re-distribute it for any reason whatever.   Fine:  if you re-distribute it as your own and claim it as your own, you are plainly committing theft.

If I upload an image and somebody innocently wants to keep a copy...

Am I surprised?   Somewhat.

Am I flattered?   Definitely.

Am I getting lawyered-up?   Of course not.

In any other context, copyright kicks in only when the creator's ownership is questioned.   That doesn't happen in the cases to which I am referring.