I am being hounded by a copywrite troll over an alleged pornography download. They have subpoenaed my name and are threatening to sue. What can I do?

You provide insufficient information to enable anyone to assist you. In order to evaluate this situation, an attorney needs to know how, exactly, you are alleged to have misappropriated the plaintiff's work of authorship, how commercially valuable that work is to the plaintiff, and what benefits, if any, you have received as a result of your alleged infringement. If you need to discuss this matter on a professional basis, please call my D.C. office at (202) 449-9484 during business hours.