Third-party licences

Symmetry Explorer, Symmetry Mechanical and Symmetry Domer use the open-source libraries listed on this page. Their authors keep the copyright; the notices and licences below are distributed with the programs (in the Help\licenses folder) as those licences require. A plain-text summary, THIRD-PARTY-NOTICES.txt, is also next to each program.

Summary

OpenTK

The Open Toolkit: opentk.net, github.com/opentk/opentk. Packages OpenTK.Core, OpenTK.Graphics, OpenTK.Mathematics, OpenTK.Windowing.Common, OpenTK.Windowing.Desktop and OpenTK.Windowing.GraphicsLibraryFramework, version 4.8.2.

MIT License

Copyright (c) 2006-2019 Stefanos Apostolopoulos for the Open Toolkit project.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

- The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

OpenTK.Half offers Half-to-Single and Single-to-Half conversions based on OpenEXR source code, which is covered by the following license:

Copyright (c) 2002, Industrial Light & Magic, a division of Lucas Digital Ltd. LLC. 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 Industrial Light & Magic nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS BE 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.

OpenTK GLControl

Package OpenTK.WinForms, version 4.0.0-pre.8: github.com/opentk/GLControl. The package states Copyright (c) 2024 Team OpenTK; its licence file reads:

MIT License

Copyright (c) 2006-2019 Stefanos Apostolopoulos for the Open Toolkit project.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

- The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

GLFW

The native GLFW library (package OpenTK.redist.glfw 3.3.8.39): www.glfw.org.

Copyright (c) 2002-2006 Marcus Geelnard

Copyright (c) 2006-2019 Camilla Löwy

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would
   be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not
   be misrepresented as being the original software.

3. This notice may not be removed or altered from any source
   distribution.

QuestPDF

QuestPDF 2026.9.1, Copyright Marcin Ziąbek and QuestPDF contributors: www.questpdf.com. Symmetry Mechanical and Symmetry Domer use it to write their PDF reports, under the QuestPDF Community License, which allows it to be redistributed as a compiled component of these programs. The complete licence (licence selection guide, Community License and Professional / Enterprise License) is in licenses/questpdf.txt.

Inside QuestPDF

QuestPDF includes the following open-source components (in its native libraries QuestPdfSkia.dll and qpdf.dll, and its built-in font). They remain under their own licences, whose full texts are in the folder licenses/questpdf/.