I think I have a moral sense that the requirement to ask an author's permission before podcasting or remixing is different from creating fanworks from a professional source without permission. I cannot pin down the logic behind these morals, and it may just be a self-protection mechanism for my own work (i.e. hypocritical). But I'm fairly sure the level of transformation doesn't play into my moral sense of what is right and wrong. I see that as a useful legal dividing line that lets me not worry about being dragged off to a dark cell for copyright infringement, but not something directly related to my feelings about the right and wrong of the situation.