I think that you can do this under "fair use", but "fair use" doesn't exist in all countries in the world.

And google has to obey to local laws and local copyrights and not just to US law.

The google book case is just another thing that's going to backfire at google. The ignorant attitude of google making foreign books (books written by authors where it is clearly illegal by the law do scan in the books and make those freely searchable on the net) available to all US citizens, even though the authors don't want their books to be available trough google, will only create more hate against google.