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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Enthought               BSD 3-Clause              LICENSE.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/demo/tools:
                 traits_ui_demo.jpg | Enthought