You are holding more than just a book. You are holding an idea. No wait, that's what you get when you hold a philosophy book. In this case, what you also get is softwarefree software. And it's all found on the publisher's web site for this book:
When you download and run the setup program provided on the web site, the following items are added to your system.
The installation requires approximately 50Mb of disk space. This appendix discusses the download and installation procedures.