Update licenses; add Huddly

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
 Copyright (c) 2026 Thomas Mittet
+Copyright (c) 2026 Huddly AS
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -2,8 +2,12 @@
 
 A modern, cross platform C# binding for [libusb](https://libusb.info/).  
 Copyright (c) 2026 Thomas Mittet, project URL: https://github.com/tmittet/UsbDotNet/.  
+Copyright (c) 2026 Huddly AS, fork URL: https://github.com/Huddly/UsbDotNet/.  
 
-NuGet packages: https://www.nuget.org/packages/UsbDotNet/.  
+This is the Huddly fork of UsbDotNet. It bundles a modified build of libusb for Windows, see
+[Third-Party libraries](#third-party-libraries) and `/THIRD-PARTY-NOTICES.md`.
+
+NuGet packages: https://www.nuget.org/packages/Huddly.UsbDotNet/.  
 
 ## License
 
@@ -17,11 +21,17 @@ included in compliance with LGPL.
 - The libusb-1.0 library is bundled with this project for convenience
 - libusb-1.0 is part of the [libusb project](https://github.com/libusb/) and is licensed under
   [LGPL-2.1](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html)
+- The `win-x64` and `win-arm64` binaries are a **modified build** of libusb-1.0, built from the
+  [Huddly libusb fork](https://github.com/Huddly/libusb); the exact branch, commit and CI build
+  are listed in `/THIRD-PARTY-NOTICES.md`
+- All other bundled binaries are unmodified builds of upstream libusb
 - Precompiled binaries are included in `/src/UsbDotNet.LibUsbNative/runtimes/`
 - You may replace the binaries with any LGPL-compliant versions
 
 ### Licensing Notes
 - The full LGPL-2.1 license text is provided in `/LICENSE.libusb`
+- Third-party notices, including the source location of the modified libusb build, are
+  provided in `/THIRD-PARTY-NOTICES.md`
 - Use of libusb doesn’t imply endorsement from the libusb project
 - If you modify or redistribute the libusb binaries, you must follow the
   [LGPL-2.1 terms](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html)

THIRD-PARTY-NOTICES.md

@@ -0,0 +1,51 @@
+# Third-Party Notices
+
+This is the Huddly fork of UsbDotNet. The original UsbDotNet project by Thomas Mittet is
+licensed under the MIT License: https://github.com/tmittet/UsbDotNet. The C# code in this
+repository remains under the MIT License (see `LICENSE`).
+
+## libusb-1.0 (LGPL-2.1)
+
+The `Huddly.UsbDotNet.LibUsbNative` package bundles precompiled binaries of
+[libusb-1.0](https://libusb.info/), which is licensed under the GNU Lesser General Public
+License, version 2.1 (LGPL-2.1). The full license text is provided in `LICENSE.libusb`
+(packaged as `licenses/LICENSE.libusb`). Use of libusb does not imply endorsement by the
+libusb project.
+
+### Modified build (Windows x64 and arm64)
+
+The `win-x64` and `win-arm64` binaries are a **modified** build of libusb-1.0, built from the
+Huddly fork of libusb:
+
+- Repository: https://github.com/Huddly/libusb
+- Branch: `libusb-v1.0.30`
+- Commit: `2ab95bfd7f9cdfb129e867e2240001772a0f3a8e`
+- Reported libusb version: `1.0.30.62037`
+
+The modifications are limited to the Windows (WinUSB) backend and are documented as change
+notices in the fork's commit history, as required by LGPL-2.1 section 2(b). Compared to
+upstream libusb 1.0.30, the fork opens the WinUSB device handle lazily on first use instead of
+on `libusb_open`, and no longer clears endpoint data before an interface claim has succeeded.
+
+The binaries were built from the commit above by the "Build libusb (Windows)" GitHub Actions
+workflow in this repository (`.github/workflows/build_libusb_windows.yml`):
+https://github.com/Huddly/UsbDotNet/actions/runs/36128292544
+
+### Unmodified builds
+
+All other bundled binaries (`win-x86`, `osx-x64`, `osx-arm64`, `maccatalyst-x64`,
+`maccatalyst-arm64`) are unmodified builds of upstream libusb:
+https://github.com/libusb/libusb. No binary is bundled for Linux; the system-installed
+libusb-1.0 is used.
+
+### Replacing the binaries
+
+libusb is dynamically linked. The binaries are located in
+`src/UsbDotNet.LibUsbNative/runtimes/<rid>/native/` in this repository and under
+`runtimes/<rid>/native/` in the NuGet package. You may replace them with any compatible
+libusb-1.0 build, as permitted by LGPL-2.1 section 6.
+
+### Maintenance
+
+Update the branch, commit, version and workflow run above on every release that changes the
+bundled libusb binaries.

UsbDotNet.sln

@@ -17,6 +17,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		LICENSE.libusb = LICENSE.libusb
 		nuget.config = nuget.config
 		README.md = README.md
+		THIRD-PARTY-NOTICES.md = THIRD-PARTY-NOTICES.md
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".github", ".github", "{9D23C15C-5ADC-4D24-9206-198A26113684}"

src/UsbDotNet.LibUsbNative/UsbDotNet.LibUsbNative.csproj

@@ -27,6 +27,9 @@
         <None Include="..\..\LICENSE.libusb" Pack="true" PackagePath="licenses/">
             <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
         </None>
+        <None Include="..\..\THIRD-PARTY-NOTICES.md" Pack="true" PackagePath="">
+            <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        </None>
         <!-- linux-arm64 - NOTE: Rely on included libusb (apt-get) on Linux -->
         <!-- linux-x64 - NOTE: Rely on included libusb (apt-get) on Linux -->
         <!-- maccatalyst-arm64 - NOTE: Not tested -->