Further Reading: Public Domain
Bollier, D. (2009). Viral spiral: How the commoners built a digital republic of their own. The New Press.
The author focuses on the digital commons, discussing how the digital world has reshaped copyright and intellectual property. More specifically, Bollier looks at open-source software, websites such as Creative Commons and its licenses, Wikipedia, YouTube, among several other topics that might prove useful and interesting to anyone curious about public domain, Intellectual Property, and Copyright.
A free download of the book can be found here: http://www.viralspiral.cc/download-book
Fishman, S. (2010). The public domain: How to find & use copyright-free writings, music, art & more (5 ed.). NOLO.
The fifth edition of this title allows readers, but particularly in the fields of writing, music and art, to identify public domain works, discussing public domain in great depth.
Additional information and Google Book preview can be found here: http://www.nolo.com/products/the-public-domain-PUBL.html