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.

Disclaimer

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

Under the following terms:

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• NonCommercial— You may not use the material for commercial purposes.

• ShareAlike— If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

• No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.