From Karl Bode in Motherboard Tech by VICE:
A coalition of archivists, activists, and libraries are working overtime to make it easier to identify the many books that are secretly in the public domain, digitize them, and make them freely available online to everyone. The people behind the effort are now hoping to upload these books to the Internet Archive, one of the largest digital archives on the internet.
As it currently stands, all books published in the U.S. before 1924 are in the public domain, meaning they’re publicly owned and can be freely used and copied. Books published in 1964 and after are still in copyright, and by law will be for 95 years from their publication date.
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