The icons are mostly derived work from other icons. As such they are
licensed accordingly to the original license:

Project                 License                   File
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GV (Gael Varoquaux)     Public Domain             N/A
Nuvola                  LGPL                      image_LICENSE_Nuvola.txt

Unless stated in this file, icons are the work of Enthought, and are
released under a 3 clause BSD license.

Files and orginal authors:
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examples/images:
            closed_folder_24x24.png | Nuvola
                  closed_folder.png | Nuvola
                       document.png | GV
                    open_folder.png | Nuvola