@lxo should every entity in the supply chain of that metal be entitled to the copyright of the sculpture? I say no they should not. In the world of copyleft, the given sheet metal comes with a condition that controls the lives and choices of the artist, saying that any sculpture that is made from the metal must become the property of everyone else who was involved in the supply chain. This makes zero sense in the context of freedom. It is the exercise of Power. Not Liberty.