All the content and that we use and create is Free Culture 
, and the code we create is Free Software . Freedom Defined names four necessary characteristics of a free cultural work:
1. Freedom to use the work itself.
2. Freedom to use the information in the work for any purpose.
3. Freedom to share copies of the work for any purpose.
4. Freedom to make and share remixes and other derivatives for any purpose.
Material licensed under CC BY or BY-SA is a free cultural work. (So is anything in the worldwide public domain marked with CC0 or the Public Domain Mark.)
All Viral Academy and Federated Wiki content is CC-BY-SA 3.0 licensed
Creative Commons’s other licenses – BY-NC, BY-ND, BY-NC-SA, and BY-NC-ND–only allow more limited uses, and material under these licenses is not considered a free cultural work.
See also Avoid Lock In