A book entering the public domain can vary from country to country. Also some rights depend on registrations, but the most important point is how many years have passed after the death of the author before the works enters into the public domain.
24 Places to Get Publish Domain Books
1. Projeckti Lonnrot
Public domain books in Finnish and Swedish.
2. Wolne Lektury
Collection of free public domain books in Polish.
3. Classical Chinese Literature
A selection of Chinese classics, each character hyperlinked to its definition and etymology.
4. Planet Publish
Popular works in pdf format.
5. Classic Reader
3810 titles by 358 authors are in public domain.
6. Great Books and Classics
Discover classic writers and philosophers from Sophocies, Epicurus and Sun-Tzu.
7. The Online Books Page
Over 1 million free books managed by the University of Pennsylvania.
8. Classic Literature Library
Organised into collections you can find the complete works of William Shakespeare, Jules Verne, Charles Dickens amongst others in public domain.
9. Open Culture
A popular blog that curates access to educational and cultural media.
You can find free audio books from texts entered public domain in Europe.
A comprehensive library of free public domain audio books.
An easily navigable site that lists completely free books from a variety of authors.
An offering of free Harvard Classics.
14. The Literature Network
Over 3,600 full books and 4,400 short stories and poems from over 250 authors.
15. Books Should Be Free
You can find thousands of free public domain books as audio books or text files in 30 languages.
16. Google Book Search
You can perform any search with Google Books search, when you see Preview or Full View under the book's title, this means you can read its scan in the browser.
Get an ebook delivered in daily instalments, delivered by mail or RSS feed.
A popular catalogue of public domain ebooks, garnered from Project Gutenberg and Internet Archive.
A site devised with mobile reading in mind, so you can download free ebooks directly to your tablet or smartphone.
20. Open Library
Over 1,000,000 free ebook titles available on this site, with a steadily growing lending library of over 200,000 contemporary ebooks.
21. Internet Archive
A massive archive of text, audio and video files including public domain titles. You can read over 5 million books from over 1,500 collections.
22. Digital Public Library of America
Get universal access to digital resources of America libraries and archives.
Gain access to millions of digitised items from European archives, libraries and museums.
24. Project Gutenberg
The biggest destination for free ebooks on the internet. Established by Michael S. Hart in 1971 it's the first ebook initiative in the world, with over 44,000 publications which are available for download on .mobi and.epub among other formats.