By that same argument, all human art is also stolen.  Look at a painting of a building.  Notice the roof tiles have a pattern.  Who made that pattern? the artist or the builder of the building? Did the painter get permission to copy that pattern when they made the painting?  Since a human is basically a data-mining machine (i.e. a very slow one) then where does that place the output they produce?   Or look at stories, there are only 7 basic themes, and everything is just a rehash of one of those themes.  So you change the name and location it will still come down to a simple underlaying theme.  And who owns the rights to those themes?

The only true art that is not stolen ideas from other people is from 1 year old kid with their crayons and even then, that is suspect as they have seen other people and things so even they have stolen ideas as to what something should look like.  i will amend that in that a person born blind and deaf will have no change to be influenced by other art so maybe what they produce could be original art.

Michelangelo paintings look an awful like the art that was around at the time he did the chapel panting, so did he get permission to copy those art styles?  And if he did does that make the chapel his or someone else's?

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14