Open Source Software

Software Licenses

Free and Open Source Software Declarations
KLANG uses free and open source software. Please see below for the open source packages
used and their respective licenses. Information about which license texts and copyright
notices refer to which source code can be taken directly from the source code we provide
according to the written offer below.

This KLANG product includes software code developed by third parties, including software
code subject to the GNU General Public License (“GPL”) and GNU Lesser General Public
License (“LGPL”). As applicable, the terms of the GPL and LGPL, and information on
obtaining access to the GPL code and LGPL code used in this product, are available to you
in this document.

Modifications of our software that is linked with libraries licensed under the LGPL are
herewith permitted for the user’s own use and reverse engineering for debugging such
modifications. However, forwarding the information acquired during reverse engineering or
debugging to third parties is not permitted. Furthermore, it is not permitted to
distribute modified versions of our proprietary software. Please note that there is no
warranty for any defects based on your modifications.

At the request of the copyright holders of the GPL and LGPL components, we refer to the
following: Our programs are distributed in the hope that they 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, the GNU Lesser General Public License and the
other applicable licenses for more details.

KLANG Free and Open Source Software (FOSS) Declaration and Licenses: Download KLANG license.txt

Details and Links for some packets:

OpenDaff: Link – Download license

kissFFT: Link – Download license

oscpkt: Link – Download license

dRowAudio: Link – Download license

uBoot – Download license

Linux – Download license

Busybox – Link – Download license

GDB – Link – Download license

FPGA_CTRL – Download license

DSPlib –  Download license

Mathlib –  Download license

wb_i2c_slave – Download license

This is just an excerpt, please refer to the full list provided in the introductory paragraph above.


Certain FOSS licenses require KLANG to make available to recipients the source
code corresponding to the FOSS binaries distributed under those licenses. Where such specific license terms entitle you
to the source code of such software, KLANG will provide to anyone upon written request via
e-mail and/or traditional paper mail within three years after the distribution of the
product by us the applicable source code via CD-ROM or USB pen drive for a nominal cost to
cover shipping and media charges as allowed under the GPL and LGPL.

Please direct all inquiries to: Email:

Mail: KLANG:technologies GmbH FOSS Requests Wespienstr. 8-10 52062 Aachen Germany

For your convenience you may also check if the requested source code is available on