Last month's court decision upholding the legality of the Google Books search engine also kept a powerful research tool available to the public.
US Circuit Judge Denny Chin says Google Books falls under fair use, while the Authors Guild calls it copyright infringement.
Publishers can now decide whether Google can digitize out-of-print books still protected by copyright, but does not settle the issue of individual author rights.
The Authors Guild is seeking more than $2 billion in damages from Google Books – which may make this one of the most expensive copyright damages cases in litigation history.
The Authors Guild says Google doesn't have permission to reproduce portions of books for their digital library.
An international group of writers are suing five American universities for copyright infringement – and sending a warning to Google Books.