As resolution decreases, the integrety of an image decreases along with it. At what point does a painting or photograph alter so much that claim of ownership is lost? Is it one pixel? Is it the point where the average viewer can no longer recognize the image? Is it less strict than that? Can changing your screen res put a piece of art into the public domain?
As an artist do you care if somebody takes your work and turns it into a 80 by 80 icon? Is it still the same piece of art that you painted? Is it still your art at 240 by 240? at 5 x 5?
At what resolution is everything public domain?