Many thanks for all the information everyone.
Malcolm, this is what someone from Google Books has to say on the copyright issue:
"Only books in the public domain -- books no longer under copyright -- have the download feature available. For users in the United States, this typically means books published before 1923. For users outside the U.S., we make determinations based on appropriate local laws. Since whether a book is in the public domain can often be a tricky legal question, we err on the side of caution and display at most a few snippets until we have determined that the book has entered the public domain. These books...may be in the public domain, but until we can be sure, we show them as if they are not."
Taken from this page