Third Party Licenses

Last updated: September 18, 2026

PolygonLogix™ Lite is built with the components below. Each is used under the licence shown, and the required notices are reproduced here. Nothing on this page changes the Terms of Service.

Components

Notices

MIT License

Applies to ACadSharp and CSMath (© Albert Domenech), QuestPDF (© Marcin Ziąbek, QuestPDF; Community licence), Entity Framework Core, ASP.NET Core, .NET and DocumentFormat.OpenXml (© Microsoft Corporation and the .NET Foundation), and ExcelDataReader (© ExcelDataReader contributors).

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.

QuestPDF Community MIT License

QuestPDF is used under its Community licence, which is the MIT License above with the QuestPDF copyright (© Marcin Ziąbek, QuestPDF contributors). PolygonLogix Lite sets QuestPDF.Settings.License = LicenseType.Community at startup.

Apache License 2.0

Applies to Stripe.net (© Stripe, Inc.) and PdfPig (© UglyToad and contributors).

Licensed under the Apache License, Version 2.0 (the "License"); you may not use these
files 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.

Boost Software License 1.0

Applies to Clipper2 (© 2010-2023 Angus Johnson).

Permission is hereby granted, free of charge, to any person or organization obtaining a
copy of the software and accompanying documentation covered by this license (the
"Software") to use, reproduce, display, distribute, execute, and transmit the Software, and
to prepare derivative works of the Software, and to permit third-parties to whom the
Software is furnished to do so, all subject to the following:

The copyright notices in the Software and this entire statement, including the above
license grant, this restriction and the following disclaimer, must be included in all
copies of the Software, in whole or in part, and all derivative works of the Software,
unless such copies or derivative works are solely in the form of machine-executable object
code generated by a source language processor.

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, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.

PostgreSQL License

Applies to Npgsql (© 2002-2025 The Npgsql Development Team).

Permission to use, copy, modify, and distribute this software and its documentation for any
purpose, without fee, and without a written agreement is hereby granted, provided that the
above copyright notice and this paragraph and the following two paragraphs appear in all
copies.

IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE
USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS
NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

SIL Open Font License 1.1

Applies to the Lato typeface (© 2010-2014 Łukasz Dziedzic). The font is used under the OFL; the full text is at scripts.sil.org/OFL.

CadLib 8.0 (WoutWare)

CadLib is commercial software licensed from WoutWare and is not open source. It is used here under that licence to read DXF and DWG files; it may not be extracted from PolygonLogix Lite or used separately.

Questions

Write to [email protected] for licence questions or to request a copy of any notice above.