What can I do about someone who is offering a book I wrote as a free download on his website without my permission?

A person owns the copyright in a book the person writes, so that person has the right to permit others to copy the book, or not to permit them to copy it.  (However, the author may give up some of his/her rights to restrict copying or restrict re-publishing of his/her book in a publishing contract such as the one you signed with Lulu.com,  so in your case you should check your contract and listing with Lulu.com to determine whether Lulu.com has the right to give permission for this other person to reprint your book.) If you did not authorize or give permission to the other person to offer your book as a free download on his website, then you have the right to sue him for copyright infringement. You will need to hire an attorney to sue him in federal court for copyright infringement and obtain an order to force him to take down your book.  Also, you can notify his website host and tell the host that he is violating your copyright and they should take down your material from his website or take down his website entirely for copyright violations. I am an attorney licensed to practice law in the State of Ohio and I am not licensed to practice law in the State of Indiana.  This answer is given for general information purposes and does not constitute legal advice specific to your situation.