* The icons in this directory are from "Material design icons".
They are not part of Emacs, but are distributed and used by Emacs.
They are licensed under the Apache License Version 2.0.
You can find that license in the LICENSE file, or at this URL:

    https://www.apache.org/licenses/LICENSE-2.0.txt

You can find the latest version of Material design icons here:

    https://github.com/google/material-design-icons/releases

To update these files, download the latest release from the above
link, and then use the function `admin-icons-update-material-icons' in
admin/admin.el.  That takes care of some necessary transformations,
that makes them work well with the way we use them in Emacs.
