Open Participatory Security is a necessary book. It is part of a new body of literature that fixes a key problem in cybersecurity thinking by reintroducing society and human conflict to a topic often reduced to the artifacts of the threat and the fear they produce, forgetting the sociotechnical nature of the internet and the way internet technologies make the world a better place. Anybody who cares about our internet culture, including but not limited to cybersecurity, will benefit from understanding what an open participatory security model will do for our internet enabled civilization.