Sans_Italic.ttf, Sans_BoldItalic.ttf, Mono_*.ttf: DejaVu fonts, Copyright (c) 2004-2010 DejaVu fonts team, Fonts are (c) Bitstream. DejaVu changes are in public domain. Glyphs imported from Arev fonts are (c) Tavmjong Bah,
provided "as is". (http://dejavu-fonts.org/wiki/License)

Sans_Regular.ttf, Sans_Bold.ttf: Droid font family, Copyright (C) 2008 The Android Open Source Project,
Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0).
(http://android.git.kernel.org/?p=platform/frameworks/base.git;a=tree;f=data/fonts;hb=HEAD)

Serif_*.ttf: Diavlo, from the exljbris Font foundry.
(http://www.josbuivenga.demon.nl/diavlo.html)
Unhinted TTF conversion & missing styles faked with FontForge.
