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If someone takes a photo of my product and posts it on the web do I have the right to use it on my website?
Not necessarily, as the "work", for copyright purposes, is the picture of the product and not the product.
Peace and Grace,
Gregory A. Beamer
If I've been selling the product, I always drop the people who produce the product a courtesy email asking permission, no one has ever said no and many have volunteered high quality images of their own to help us out.
Required, but never shown