DVIcons is in the public domain.

The following was taken from <http://dejavu-fonts.org/wiki/License> on 7/4/2015:

Fonts are © Bitstream (see below). DejaVu changes are in public domain. Explanation of copyright is on Gnome page on Bitstream Vera fonts. Glyphs imported from Arev fonts are © Tavmjung Bah (see below)
Bitstream Vera Fonts Copyright

Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Bitstream Vera is a trademark of Bitstream, Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of the fonts accompanying this license ("Fonts") and associated documentation files (the "Font Software"), to reproduce and distribute the Font Software, including without limitation the rights to use, copy, merge, publish, distribute, and/or sell copies of the Font Software, and to permit persons to whom the Font Software is furnished to do so, subject to the following conditions:
* The above copyright and trademark notices and this permission notice shall be included in all copies of one or more of the Font Software typefaces.
* The Font Software may be modified, altered, or added to, and in particular the designs of glyphs or characters in the Fonts may be modified and additional glyphs or characters may be added to the Fonts, only if the fonts are renamed to names not containing either the words "Bitstream" or the word "Vera".
* This License becomes null and void to the extent applicable to Fonts or Font Software that has been modified and is distributed under the "Bitstream Vera" names.
* The Font Software may be sold as part of a larger software package but no copy of one or more of the Font Software typefaces may be sold by itself.


The added icon glyphs were taken from <https://aur.archlinux.org/packages/ttf-font-icons/>, licensed under an MIT license:

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.