The only sure-fire way to make sure no one can save your art is to not put it online.  Even if we disable right clicking or make the image encased in a flash setting, someone could still do a screen capture.  We have, actually, in the past, implemented a no-right-click process...not only did it slow down the site SUBSTANTIALLY, many members were highly upset, as they use their right mouse button to navigate the site.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.