I was selling mp3 copies of a Radio program that I thought was in the public domain, but apparently is not. I received a very threatening letter from the rights owner stating that they could sue me for millions of dollars. They want me to mail them information as to who the files were sold to including their addresses, which I am not comfortable with. I only sold 2 CD's of the files. I have complied by removing the content and updating the page with a direct link to them. I don't have much money and I'm not sure what I should do. My website has been setup as an LLC. Any advice would be great. Thanks.