When you sign up, it embeds your name on one of the front pages. In my case, the books belong to me, Furz Berstertocken.
Using calibre edit, I was able to change it to my real name, Blass Fisterbuster, Jr.
I should note that I did not accept the warning about cookies. I ignored it, much in the same way I ignore traffic signs, red lights, and elderly people who cross the street.
All 12 books look nice in my calibre library. Some day, I may decide to read one. In the meantime, I've got a rash on my scalp that seems to be spreading down my neck and back, as it makes its way unerringly toward my left buttock.
I'm currently looking for a layman's book on suppurating rashes, their cause and prevention.
