Open Source Software (OSS) is software which source code and other rights, that normally belong exclusively to those who have author rights, are published under a software license compatible with the Open Source Definition or are part of public domain.
Now users are able to use the software for free, change, improve and redistribute the software.
There are several Open Source licenses, such as GNU General Public License (GPL), MIT, Apache License 2.0, Mozilla Public License 2.0 etc.

Mapa conceptual del software libre – René Mérou – http://es.gnu.org/~reneme/map/es/ – CC BY-SA 3.0
Here’s how to fix a linux computer
By the Oatmeal, have fun.

How to fix a Linux Computer – The Oatmeal
Good post. Maybe you should go deeper into each license.
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Maybe, if you want to know more about each licence, github has a really nice page about open source licences. http://choosealicense.com/ c;
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