Abstract: The public domain is the sovereign space of all citizens of the world. Like the air we breathe, it is free for all people to use, without restriction, no rights reserved. Our public ownership of this domain of knowledge should be understood as a fundamental human right to access our shared knowledge, the use of which is not the result of a grant by any specific government. In this book, the members of Communia not only articulates this positive conception of our public domain, but also seek to make the European public domain actionable.