A key part of the concept of copyright is that having copyrighted works used without consent is perfectly fine. Copyright grants an exclusive right to make copies of the work. It does not grant the author control over how their work is used, quite the opposite, you can use a legitimately obtained copy however you want without the consent of the author (and even against explicit requirements of the author) as long as you are not violating the few explicitly enumerated exclusive rights the author has.

You do not need an author's consent to dissect or analyze their work or to train a ML model on it, they do not have an exclusive right on that. You do not need an authors consent to make a different work in their style, they do not have an exclusive right on that.