> Lester Freundlich, an attorney for the MTA, told Berman in an email Wednesday that his subway map was “clearly a derivative work of MTA’s current version of the Vignelli subway map.”
The MTA's attorney literally calls his map a "derivative work" which is something that's protected by Fair Use. When I read that in the article, I immediately thought that the artist's response should have been, "Thanks for clarifying that it's clearly a derivative work; so you'll drop the claim now?"
EDIT: For anyone reading this without additional context, I should clarify, derivative works are protected as long as they're transformative, which this seems pretty clearly enough so to count. So, it's less a point that being a derivative work itself means it's protected, than the point that being a derivative work doesn't mean it's not protected like the MTA's attorney seemed to imply.