"Yes, Renderosity has my permission to use my artwork from my art gallery for promotional use only. Creator retains all copyrights to material." S. Backus I'm with Dave though - if viewers of the images want to contact artists how will they know whom to contact? Is the image owner information(i.e. username) included with the image?

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo