From the author’s website: “FREE to download and use”. There was no pirating, let alone ‘very much’ of it. http://gallery.hd.org/_c/natural-science/prism-and-re

From the author’s website: “FREE to download and use”. There was no pirating, let alone ‘very much’ of it. http://gallery.hd.org/_c/natural-science/prism-and-refraction-of-light-into-rainbow-2-AJHD.jpg.html http://gallery.hd.org/_c/natural-science/prism-and-refractio... Also, here’s the HN discussion about it: https://news.ycombinator.com/item?id=5868220 https://news.ycombinator.com/item?id=5868220