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

    GV: Gael Varoquaux: BSD-like
    Crystal: LPGL
    Nuvola: LGPL

Unless stated in this file, icons are work of enthought, and are released
under BSD-like license.
Files and orginal authors:
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enthought/block_canvas/canvas/images:
                    bluebullet.png | Nuvola
                bluebulletover.png | Nuvola
           close_button_normal.png | GV
             close_button_over.png | GV
          expand_button_normal.png | Nuvola
           expand_button_ovrer.png | Nuvola
                    input_icon.png | Crystal
                   output_icon.png | Crystal
