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"The way to make 20th Century books available to library patrons is to digitize those books and let every library who owns a physical copy lend that book in digital form. This type of service has come to be known as controlled digital lending (CDL). The Internet Archive has been doing this for years. We lend out-of-copyright and in-copyright volumes that we physically own. We’ve reformatted the physical volume, produced a digital version and lend only that digital version to one user at a time. Our experience shows that this responds to a real demand, fills a genuine need satisfactorily, gives new life to older books, and brings important knowledge to a new audience. Check out this case study for CDL involving the book Wasted which figured prominently in the Brett Kavanaugh Supreme Court nomination hearings.Most 20th Century Books Unavailable to Internet Users – We Can Fix That | Internet Archive Blogs
Our experience has been replicated by other early adopters and providers of a CDL service. Here’s a list of some of them. We believe every library can transform itself into a digital library. If you own the physical book, you can choose to circulate a digital version instead.
We urge more libraries to join Open Libraries and lend digitized versions of their print collections, making more copies of books available for loan and getting more books into the hands of digital readers everywhere."