Chapter 2
Legal Notices

2.1 Introduction

ngscopeclient, libscopehal, and the remainder of the project are all released under the 3-clause BSD license (reproduced below). This is a permissive license, explicitly chosen to encourage integration with third-party open source and commercial projects.

2.2 License Agreement

Copyright (c) 2012-2025 Andrew D. Zonenberg and contributors. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of the author nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE HELD LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

2.3 Trademarks

This document frequently mentions the names of various test equipment vendors and products in order to discuss ngscopeclient’s compatibility with said products. The reader should assume that these are all trademarks of their respective owners.

2.4 Third Party Licenses

• vkFFT (static, MIT license) - https://github.com/ngscopeclient/VkFFT/blob/master/LICENSE
• half (static, MIT license) - https://github.com/ngscopeclient/VkFFT/blob/master/half_lib/half.hpp
• canvas_ity (static, ISC license) - https://github.com/a-e-k/canvas_ity/blob/main/LICENSE.txt
• avx_mathfun.h (static, zlib license) - https://github.com/ngscopeclient/scopehal/blob/master/scopehal/avx_mathfun.h
• Dear ImGui (static, MIT license) - https://github.com/ngscopeclient/imgui/blob/docking/LICENSE.txt
• imgui_markdown (static, zlib license) - https://github.com/enkisoftware/imgui_markdown/blob/main/License.txt
• imgui-node-editor (static, MIT license) - https://github.com/ngscopeclient/imgui-node-editor/blob/master/LICENSE
• stb-image (static, MIT license) - https://github.com/ngscopeclient/imgui-node-editor/blob/master/external/stb_image/stb_image.h
• ImGuiFileDialog (static, MIT license) - https://github.com/aiekick/ImGuiFileDialog/blob/master/LICENSE
• Native File Dialog Extended (static, zlib license) - https://github.com/btzy/nativefiledialog-extended/blob/master/LICENSE
• dbus (shared, LGPLv2.1 license) - https://gitlab.gnome.org/GNOME/glib/-/blob/main/COPYING
• Vulkan-Hpp (static, Apache-2.0 license) - https://github.com/KhronosGroup/Vulkan-Hpp/blob/main/LICENSE.txt
• vulkan-headers (static, MIT license) - https://github.com/KhronosGroup/Vulkan-Headers/blob/main/LICENSE.md
• yaml-cpp (shared, MIT license) - https://github.com/jbeder/yaml-cpp/blob/master/LICENSE
• vulkan-loader (shared, Apache-2.0 license) - https://github.com/KhronosGroup/Vulkan-Loader?tab=License-1-ov-file#readme
• zlib (shared, zlib license) - https://zlib.net/zlib_license.html
• glfw (shared, zlib license) - https://www.glfw.org/license
• glslang (shared, BSD-3, BSD-2, MIT, and Apache-2.0 licenses) - https://github.com/KhronosGroup/glslang/blob/main/LICENSE.txt
• libsigc++ (shared, LGPLv3 license) - https://github.com/libsigcplusplus/libsigcplusplus/blob/master/COPYING
• libpng (shared, libpng license) - http://www.libpng.org/pub/png/src/libpng-LICENSE.txt
• liblxi (shared, BSD-3/EPICS license) - https://github.com/lxi-tools/liblxi/blob/master/LICENSE
• GTK 3.0 (shared, LGPLv2 license) - https://gitlab.gnome.org/GNOME/gtk/-/blob/main/COPYING
• hidapi (shared, BSD-3 license) - https://github.com/libusb/hidapi/blob/master/LICENSE.txt
• libtirpc (shared, BSD-3 license) - https://github.com/alisw/libtirpc/blob/master/COPYING
• OpenMP (shared, GPLv3 license with GCC Runtime Library Exception) - https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgomp/libgomp.h

2.4.1 Optional, only used if installed at compile time

• linux-gpib (shared, GPLv2 license) - https://sourceforge.net/p/linux-gpib/git/ci/master/tree/linux-gpib-user/COPYING

2.4.2 Only in unit tests

• FFTS (shared, BSD-3) - https://github.com/anthonix/ffts/blob/master/COPYRIGHT
• catch2 (static, Boost license) - https://github.com/catchorg/Catch2/blob/devel/LICENSE.txt - only used in unit tests