# Copyleft Notice

This book is **Libre** and follows the philosophy of [Free Software4:](https://www.gnu.org/philosophy/free-sw.en.html). You can use this book as you like and the [source is available5](https://harmeetsingh.gitbook.io/scala-type-system/). You can redistribute this book and you can distribute your own version. That means you can print it, photocopy it, e-mail it, upload it to websites, change it, translate it, charge for it, remix it, delete bits and draw all over it.

This book is **Copyleft:** if you change the book and distribute your own version, you must also pass these freedoms to its recipients.

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit <http://creativecommons.org/licenses/by-sa/4.0/> or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.