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Sorry if this comes up twice, I've been having internet connection issues. This is a really great article about an artist who made a pixellated version of a Miles Davis photograph for his chiptune tribute.  The photographer sued him and the artist lost.  It's just really important to ask ourselves where the line between copy and transformative work should be drawn and the artist (who wrote the article) provides several examples of items for sale that he finds to be similar to his work, yet appear unchallenged.