# Introduction

## This book is made available under the following creative commons license:

### <https://creativecommons.org/licenses/by-nc-sa/3.0/>

#### Attribution-NonCommercial-ShareAlike 3.0 Unported(CC BY-NC-SA 3.0)

This is a human-readable summary of (and not a substitute for) the [license](https://creativecommons.org/licenses/by-nc-sa/3.0/legalcode).

[Disclaimer](https://creativecommons.org/licenses/by-nc-sa/3.0/)

### You are free to:

* **Share**

  — copy and redistribute the material in any medium or format
* **Adapt**

  — remix, transform, and build upon the material

The licensor cannot revoke these freedoms as long as you follow the license terms.

### Under the following terms:

* **Attribution**—You must give [appropriate credit](https://creativecommons.org/licenses/by-nc-sa/3.0/), provide a link to the license, and [indicate if changes were made](https://creativecommons.org/licenses/by-nc-sa/3.0/). You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
* **NonCommercial**— You may not use the material for [commercial purposes](https://creativecommons.org/licenses/by-nc-sa/3.0/).
* **ShareAlike**— If you remix, transform, or build upon the material, you must distribute your contributions under the [same license](https://creativecommons.org/licenses/by-nc-sa/3.0/) as the original.
* **No additional restrictions** — You may not apply legal terms or [technological measures](https://creativecommons.org/licenses/by-nc-sa/3.0/) that legally restrict others from doing anything the license permits.
