All licenses mentionned in this file can be found in directory LICENSES.

Without any specific mention :

All software related files, as sources or build automation files, are under AGPL license (LICENSES/agpl-3.0.txt)
All not software related files, as images under .png format and .tex files, are licensed under CC-BY-SA license (LICENSES/cc-by-sa.txt)
All software related files in a directory named "examples" or "example" are licensed under GPLv3 license (LICENSES/gpl-3.0.txt)

If a file is not licensed under previous rules, its license will be mentionned either by a comment in its first lines, or by an additional 
LICENSE.txt file in the same directory it is.