Every year new publications enter public domain. That
means their intellectual property rights have expired or are not
applicable any longer.
The dates books enter public domain vary between countries. Some rights depend on registrations with a country-by-country basis, but the most important factor is how many years have to pass after the death of the creator to allow the works into public domain.
Bibliomania - includes fully searchable full-text editions of classic works of fiction, non-fiction, poetry, and a few reference titles. The complete plays of Shakespeare are featured, as well as major titles from Austen, Dickens, Twain, Freud, Benjamin Franklin, Vatsyayana, and many others. New titles are being added.