This story came out a couple of weeks ago (more? less?), but Confessions of a Mad Librarian provides a great deal more detail.
What Google will provide to the public —
* Works in copyright won’t be fully available
* For copyrighted works — there will be a click-through to the appropriate OCLC WorldCat record
Approximately 10% of Stanford’s overall collection is clearly out of copyright; other material in the public domain (such as U.S. government documents) will be included in the project Google will be responsible for determining what’s in copyright and what’s not if there are any questionable materials and copyright will drive what will be fully displayed There’s no special provision to fully display material in the last 20 years of copyright