All the content is under Licencia Editorial Abierta y Libre (LEAL). You can read it here.
“Licencia Editorial Abierta y Libre” is translated to “Open and Free Publishing License.” “LEAL” is the acronym but also means “loyal” in Spanish.
With LEAL you are free to use, copy, reedit, modify, share or sell any of this content under the following conditions:
Anything produced with this content must be under some type of LEAL.
All files—editable or final formats—must be on public access.
The sale can't be the only way to acquire the final product.
The generated surplus value can't be used for exploitation of labor.
The content can't be used for AI or data mining.
The use of the content must not harm any collaborator.
Finally, all the code is under GPLv3. Now, you can fork this shit: