UltraVox™ is a trademark of Noldus Information Technology BV. UltraVox XT would not be what it is without the use of third-party software. This page lists software libraries and other software products used in UltraVox XT and where you can find license and compliance information and/or acknowledgments for that product.
The PDF of the copyright notices are stored in
C:\Program Files\Noldus\UltraVox XT 4\Documentation\Legal\Acknowledgments.
Asio
Cross-platform C++ library for network and low-level I/O programming. Version 1.32.0. Copyright © 2003-2024 Christopher M. Kohlhoff. Distributed under the Boost Software License, Version 1.0.
https://github.com/chriskohlhoff/asio/tree/master
https://github.com/chriskohlhoff/asio/blob/master/asio/LICENSE_1_0.txt
bb-audio
Library for recording, handling and analyzing audio files. Version 1.6.1. Copyright © 2025 Brain Builders BV.
bb-license
Library for handling license restrictions. Version 2.2.0. Copyright © 2025 Brain Builders BV.
ed25519
Public-key signature system used for verifying audio files and licenses.
Copyright © 2015 Orson Peters. Distributed under the zlib license.
https://github.com/orlp/ed25519
https://github.com/orlp/ed25519/blob/master/license.txt
{fmt}
Open-source string formatting library for logging. Version 11.0.2.
Copyright © 2012 - present, Victor Zverovich and {fmt} contributors.
https://github.com/fmtlib/fmt/blob/master/LICENSE
GCC
Integrated distribution of compilers for several major programming languages.
Copyright © 2023 The Free Software Foundation, Inc. This program is distributed under the GNU General Public License.
muFFT
Library for performing the Fast Fourier Transform (FFT) in one or two dimensions.
Copyright © 2015 Hans-Kristian Arntzen.
https://github.com/Themaister/muFFT
https://github.com/Themaister/muFFT/blob/master/COPYING
nlohmann json
Class of JSON libraries used for reading license files. Version 3.11.3.
Copyright © 2013-2024 Niels Lohmann.
https://github.com/nlohmann/json
https://github.com/nlohmann/json/blob/develop/LICENSE.MIT
OpenSSL
Toolkit for general-purpose cryptography and secure communication. Version 3.4.0. OpenSSL is licensed under the Apache License 2.0.
Copyright © 2025 OpenSSL.
https://github.com/openssl/openssl/blob/master/LICENSE.txt
PortAudio
PortAudio is a cross-platform, open-source C language library for real-time audio input and output. Version 19.7. PortAudio is licensed under MIT license.
https://portaudio.com/license.html
Qt
Qt is a cross-platform application development framework for creating graphical user interfaces. Version 6.7.3. Qt used in UltraVox XT development is licensed under a commercial license.
https://doc.qt.io/qt-6/licensing.html
Simpleini
Simpleini is a cross-platform library that provides a simple API to read and write ini-style configuration files. Version 4.20. Simpleini is licensed under the MIT License.
Copyright © 2006-2024 Brodie Thiesfield.
https://github.com/brofield/simpleini
https://github.com/brofield/simpleini/blob/master/LICENCE.txt
Spdlog
Spdlog is a C++ logging library. Version 1.15.0. Spdlog is licensed under the MIT License.
Copyright © 2016 Gabi Melman.
https://github.com/gabime/spdlog
https://github.com/gabime/spdlog/blob/v1.x/LICENSE
Ultravox Library
Software development kit for all UltraVox XT functionality. Version 1.1.1. Copyright © 2025 Brain Builders BV.