Unglue.it is a service provided by Gluejar, Inc. It's a place for individuals and institutions to join together to liberate specific ebooks and other types of digital content by paying rights holders to relicense their works under Creative Commons licenses.
What does this mean?
Book-lovers and libraries everywhere can join together to set books free.
Authors and publishers get the compensation they deserve.
Books that are out of print, not available as ebooks, or otherwise hard to enjoy will be available for everyone to read, share, learn from, and love -- freely and legally.