Among other things, Paul Zukofsky writes:
So, in homage to Lawrence Lessig:Despite what you may have been told, you may not use LZ’s words as you see fit, as if you owned them, while you hide behind the rubric of “fair use”. “Fair use” is a very-broadly defined doctrine, of which I take a very narrow interpretation, and I expect my views to be respected. We can therefore either more or less amicably work out the fees that I demand; you can remove all quotation; or we can turn the matter over to lawyers, this last solution being the worst of the three, but one which I will use if I need to enforce my rights.
In general, as a matter of principle, and for your own well-being, I urge you to not work on Louis Zukofsky, and prefer that you do not. Working on LZ will be far more trouble than it is worth. You will be far more appreciated working on some author whose copyright holder(s) will actually cherish you, and/or your work. I do not, and no one should work under those conditions. However, if you have no choice in the matter, here are the procedures that I insist upon, and what you must do if you wish to spare yourself as much grief as possible.