The books out of copyright thread

Does anyone know the exact time span before a book can be considered public domain. I can see on Google Docs, a wealth of anniversary books, but nothing beyond 1922 is viewable or downloadable.

By this logic, you'd expect, the that copyright of a book is 85 years. This would mean we would have to wait till 2015 till anniversary stuff starts being available, and 2035 till Simplified starts being available. Diamond Jubilee users will be dead before they can access their books.

From what I've read, Google is fighting the book publishers for out-of-print but copyrighted books to become available, albeit with a cost. So that's the story. Feel free to elaborate.

(by michael_lisitsa for everyone)