This work is licensed under a Creative Commons license, specifically the Attribution-Noncommercial-Share Alike 3.0 New Zealand License. This means that it is legal to make and share copies of this work with anyone, as long as you do not do so for commercial gain.
The main idea is that anyone may make copies of this work, for example, for personal or educational purposes, but only the publisher of the print version is allowed to sell copies.
For more information about the motivation behind this license, please see the book web site.
Paul Murrell
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 New Zealand License.