A partnership effort lead by the Carnegie Mellon University, with several servers, mirror-sites and 50 scanning centers hosted all over the world, this ambitious project aims at preserving and making freely available the human knowledge in digital format – planning to reach 10 million books within the next 10 years. The content currently available spans from the XVI century to 2007, in over 20 language and about 50 topics of general interest, from Education to Geography, to Drama, Health, Biology, etc., for a total of over 1,1 million books – even if the while the project seems to have stopped in early 2008. The UDL has books that are both in and out of copyright (that is, published after or before 1923), and adheres to copyright policies of all countries in the strictest possible interpretation. Along with a simple title search and advanced options, such as by year, subject, author, etc. users can also browse the collection by subject, language, year, author or title alphabetical order. For viewing UDL books, users need either a DjVu plugin and/or a Tiff plug-in, while the project has future plans to provide book content directly as pdf files – along with future initiatives aimed at creating digital libraries for newspapers, monuments, and spoken languages. The website is quite simple and easy to navigate, also providing tips and FAQ, but lacks any social option.