books.google.es - FreeBSD and OpenBSD are increasingly gaining traction in educational institutions, non-profits, and corporations worldwide because they provide significant security advantages over Linux. Although a lot can be said for the robustness, clean organization, and stability of the BSD operating systems, security...http://books.google.es/books/about/Mastering_FreeBSD_And_OpenBSD_Security.html?hl=es&id=gqKwaHmXp4YC&utm_source=gb-gplus-shareMastering FreeBSD And OpenBSD Security
