The below example illustrates what lawyers and judges refer to as the "idea-expression" dichotomy. Basically, it is perfectly legal to be inspired by the idea or ideas behind another author's work, but it is illegal (a violation of the Copyright Act) to take the original expression from the work of another. Where does the line get drawn? That's up to the Judge, but this case appears to me to be one where the expression has been lifted. Agree?
Infamous Apparel (owned by department store Tilly's) stole a design I did for the Salvation Army's Wardrobe Apparel. It is currently on their store racks.
100% of the proceeds generated from TSA's clothing is donated to people in dire need, world wide. People holding onto their lives depend on this kind of support. For shame, Tilly's, taking money away from those in need. Have you no heart?
My original design:
Their design (notice they didn’t even bother changing much):