Altering a copyrighted item, no matter how much, is still infringement and well within the rights of the copyright holder to assume possession of that derivative work since it is a violation of the original copyright. Statements such as, "If there is any concern regarding a particular pose or the data used to generate it, please contact me," are not adequate protection. It's not up to the copyright holder to search for every violation to stop each encroachment. If that were a real legal loophole, I could legally sell copies of Star Wars III till LucasFilms finds me and asks me to stop. Then I'll sell copies of the Simpsons till they find out and ask me to stop. Once everybody's told me to stop, I'll start up a new company and do it all over again. Try to imagine how impossible it would be to retain one's copyright if millions of people did the same thing and the copyright holder has to find each and every one of them and politely ask them to stop.