# Third-party Notices

Licence and attribution summary for software redistributed with Opia.

> Applies to Opia 26.8.1.

## Overview

Opia includes third-party libraries, frameworks, runtime components and open-source software. Each third-party component remains subject to its own licence terms; the Opia EULA does not replace or override them.

Nu-topia Solutions Ltd. acknowledges the rights of third-party copyright holders. The complete exact-version licence and notice collection accompanies the Software offline.

## Runtime and application components

The following table summarises the components redistributed by the Opia App, Agent, MSI or offline setup. The installed dependency manifest provides the full per-package mapping.

| Component | Version | Purpose | Licence and attribution | Distribution note |
| --- | --- | --- | --- | --- |
| .NET self-contained Windows runtime, WPF, Microsoft.Extensions, Entity Framework Core, Microsoft.Data.Sqlite and Microsoft system support packages | 10.0.10, except System.Security.Cryptography.Pkcs 10.0.0 | Windows desktop runtime, hosting, data, configuration, logging and service support. | MIT. Copyright .NET Foundation and Contributors and/or Microsoft Corporation, as identified by each package. | The final App, Agent and bootstrapper payloads include the exact runtime `LICENSE.TXT`, `THIRD-PARTY-NOTICES.TXT` and package notices. `Microsoft.Extensions.Hosting.WindowsServices 10.0.10` is part of the Agent runtime. |
| CommunityToolkit.Mvvm | 8.4.2 | Desktop MVVM infrastructure. | MIT. Copyright .NET Foundation and Contributors. | The package's `License.md` and `ThirdPartyNotices.txt` are retained. |
| SQLitePCLRaw and SourceGear.sqlite3 / SQLite | 3.0.3 and 3.50.4.5 / SQLite 3.50.4 | Managed and native local database provider. | Apache License 2.0 for SQLitePCLRaw. SQLite is dedicated to the public domain; SourceGear package metadata identifies Copyright 2014–2025 SourceGear, LLC. | The Apache text and SourceGear package `LICENSE.txt` are retained. |
| Serilog family | 4.3.1; Hosting 9.0.0; Logging 9.0.0; Compact 3.0.0; Configuration 10.0.0; File 7.0.0 | Structured diagnostic logging. | Apache License 2.0. Copyright Serilog Contributors. | The Apache-2.0 text and package metadata are retained. |
| SSH.NET | 2026.0.0 | SSH connectivity for network devices. | MIT. Copyright Renci 2010–2026. | The MIT text and copyright metadata are retained. |
| MailKit, MimeKit and BouncyCastle.Cryptography | 4.16.0, 4.16.0 and 2.7.0 | Email notification transport and its cryptography dependency. | MIT. Copyright .NET Foundation and Contributors and Legion of the Bouncy Castle Inc. 2000–2026, as applicable. | The MIT text, package metadata and Bouncy Castle `LICENSE.md` are retained. |
| Quartz family | 3.18.0 | Scheduling and job orchestration. | Apache License 2.0. Copyright Marko Lahma and contributors. | The Apache-2.0 text and package metadata are retained. |
| DiffPlex | 1.9.0 | Configuration comparison. | Apache License 2.0. DiffPlex contributors. | The declared Apache-2.0 terms are retained. |
| QuestPDF | 2026.2.4 | Topology PDF and report generation. | QuestPDF Community License 3.0, effective 6 July 2026. Copyright Marcin Ziąbek and QuestPDF contributors. QuestPDF is source-available commercial software, not MIT-licensed software. | Nu-topia Solutions Ltd. has recorded eligibility for the selected Community tier and Opia selects `LicenseType.Community`. Commercial application use and royalty-free compiled redistribution are permitted while eligibility continues. Reassess on eligibility, package-version or applicable-terms changes. |
| QuestPDF native dependency closure | As bundled by QuestPDF 2026.2.4 | Native PDF, graphics, compression and compiler runtime support. | Package-provided notices cover emsdk, expat, HarfBuzz, libgrapheme, libjpeg-turbo, libpng, libwebp, Ninja, qpdf, Skia, Wuffs and zlib under their stated terms. | Every exact `ExternalDependencyLicenses` file supplied by the pinned package is retained. |
| Lato font family | Bundled font files | Document rendering fonts. | SIL Open Font License 1.1. Copyright 2010–2014 tyPoland Łukasz Dziedzic; reserved font name “Lato”. | The MSI installs `LatoFont\OFL.txt` beside the font files and includes the same text in the installed collection. |
| WiX Toolset Burn engine and BootstrapperApplicationApi | 7.0.0 | Offline setup engine and bootstrapper host API. | Microsoft Reciprocal License (MS-RL), with the binary package's separate Open Source Maintenance Fee Agreement (`OSMFEULA.txt`). Copyright .NET Foundation and contributors. | The setup redistributes the Burn engine/stub, `WixToolset.BootstrapperApplicationApi.dll` and `mbanative.dll`. The collection preserves MS-RL, OSMF EULA v1.1 and the WiX 7.0.0 corresponding source record for release tag `v7.0.0`, package source commit `b8977d6f88e7b68e000bac226a2814f236770570`. First-party Opia bootstrapper code does not become MS-RL merely by using the API. |