Blender Main I18n font ("droidsans.ttf") includes glyphs imported from the following fonts:

1. DejaVu Sans
2. Droid Sans Regular
3. Samyak-devanagari
4. Droid Sans Hebrew Regular
5. Droid Sans Ethiopic Regular

These were merged using FontForge in (approximately) the above order. For each glyph,
a license of the font from which it was imported is applied.

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Summary of Copyrights and Licenses

(1) DejaVu Sans

Copyright: 2003 Bitstream, Inc. (Bitstream font glyphs)
           2006 Tavmjong Bah (Arev font glyphs)
           DejaVu changes are in public domain

License:
 DejaVu font glyphs are same as bfont.ttf. See LICENSE-bfont.ttf.txt.

(2), (4), (5) Droid Sans Fonts family

Copyright:
    Copyright © 2006, 2007, 2008, 2009, 2010 Google Corp.
    Droid is a trademark of Google Corp.

License: Apache-2.0
 See Appendix A.

(3) Samyak-devanagari
Copyright: 2005-2006, Rahul Bhalerao <b.rahul.pm@gmail.com>
           2005-2006, Bageshri Salvi <sbageshri@gmail.com>
           2005-2006, Pravin Satpute <pravin.d.s@gmail.com>
           2005-2006, Sandeep Shedmake <Sandeep.shedmake@gmail.com>

License: GPL-3 with font embedding exception
 See Appendices B.

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Appendix A. Apache License Version 2.0

 Licensed under the Apache License, Version 2.0 (the "License"); you
 may not use this file except in compliance with the License. You may
 obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 implied. See the License for the specific language governing
 permissions and limitations under the License.

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Appendix B. GNU GPL Version 3 with font embedding exception

GPL-3:
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.

Font embedding exception:
 As a special exception, if you create a document which uses this
 font, and embed this font or unaltered portions of this font into
 the document, this font does not by itself cause the resulting
 document to be covered by the GNU General Public License. This
 exception does not however invalidate any other reasons why the
 document might be covered by the GNU General Public License. If you
 modify this font, you may extend this exception to your version of
 the font, but you are not obligated to do so. If you do not wish to
 do so, delete this exception statement from your version.
