Curiously...how many downloads to you THINK may have been done to the book? Have you notified Google that the spider indexed the page and it needs to be removed (in addition to your removing the copy) - erase any reference that it was there. There is a content removal link at Google.
How did the author discover it? Just out searching his name and your link was there?
Your personal space does not have a password protection? In other words, it was published to a public website? If it were password protected, the hits could have come from something else since no one could access it. I’m trying to help assess how many hits actually came from visitors who happened upon your site. People pay a fortune for search engine results to get people to their site and this content just happened to be found out there? They either searched for the book (is it a best seller or something?) and found your link (as mentioned get that removed)...or, not too many people found your personal URL pdf by surfing out on the web.
I KNOW how many downloads there were. Since it was a PDF the download is automatic.
How did the author discover it?
Someone else informed him of the link from Google.
Your personal space does not have a password protection?
No password protection on the site. It is open to the public. Folks got to the book directly from Google.