"[T]he authors argue that the Public Domain — that is, the informational works owned by all of us, be that literature, music, the output of scientific research, educational material or public sector information — is fundamental to a healthy society."
Sources
Melanie Dulong de Rosnay and Juan Carlos De Martin (editors); Communia (host); Open Book Publishers (publisher); unglue.it (host)
Details
About libre and open access more broadly as well as the public domain specifically.
Available in PDF for no charge, and also for charge in a number of print formats.
Now on unglue.it in DRM-free PDF and EPUB form, with an option to donate (link).