Attn: Authors. There is a website, general-ebooks.com that is offering free downloads of ebooks without permission. Please go to this website and see if your books are listed for free downloads. If so, it's essential that you contact them (link is bottom right of page) and tell them to cease and desist. It's also necessary for you to contact your publisher regarding this website.
I don't know how this got started, but we've found three (3) of our books on it, and some author friends have found all of their books on it. Have a care.