Document third-party licenses and fix the Unity Capture notice

- Add THIRD-PARTY-NOTICES.md listing bundled components and their licenses
- State that the prebuilt Windows build is GPL-2.0 because it bundles pyvirtualcam
- Replace the Unity Capture license file, which held a 404 error page instead of the MIT text

README.md

@@ -98,4 +98,6 @@ Package a standalone `.exe` with PyInstaller (onedir):
 
 ## License
 
-MIT — see [LICENSE](LICENSE).
+FlexCam's own source code is MIT — see [LICENSE](LICENSE).
+
+The prebuilt Windows download bundles [pyvirtualcam](https://github.com/letmaik/pyvirtualcam) (GPL-2.0), so that build is distributed under the GPL-2.0 as a whole. See [THIRD-PARTY-NOTICES.md](THIRD-PARTY-NOTICES.md) for the full list.

THIRD-PARTY-NOTICES.md

@@ -0,0 +1,31 @@
+# Third-party notices
+
+FlexCam's own source code is licensed under the MIT License (see [LICENSE](LICENSE)).
+
+The prebuilt Windows application distributed on the releases page bundles the
+third-party components listed below. Because it includes **pyvirtualcam**,
+which is licensed under the GNU General Public License v2.0, the bundled
+Windows build as a whole is distributed under the terms of the **GPL-2.0**.
+The complete corresponding source code is available at
+https://github.com/This-null/flexcam — the MIT licensing of FlexCam's own
+source is unaffected.
+
+## Bundled components
+
+| Component | Version | License |
+| --- | --- | --- |
+| [pyvirtualcam](https://github.com/letmaik/pyvirtualcam) | 0.15.0 | GPL-2.0 |
+| [pystray](https://github.com/moses-palmer/pystray) | 0.19.5 | LGPL-3.0 |
+| [pywebview](https://github.com/r0x0r/pywebview) | 6.2.1 | BSD-3-Clause |
+| [Pillow](https://github.com/python-pillow/Pillow) | 12.3.0 | MIT-CMU |
+| [NumPy](https://github.com/numpy/numpy) | 2.5.2 | BSD-3-Clause |
+| [pypresence](https://github.com/qwertyquerty/pypresence) | 4.6.2 | MIT |
+| [Unity Capture](https://github.com/schellingb/UnityCapture) filter | — | MIT |
+| Android Debug Bridge (`adb`) | — | Android SDK terms |
+
+Unity Capture is Copyright (c) 2018 Bernhard Schelling, based on UnityCam,
+Copyright (c) 2016 MHD Yamen Saraiji. Its full license text ships with the
+application in `virtualcam/LICENSE-UnityCapture.txt`.
+
+`adb.exe` and its DLLs are part of the Android SDK Platform-Tools, distributed
+by Google under the Android Software Development Kit License Agreement.

pc/virtualcam/LICENSE-UnityCapture.txt

@@ -1 +1,26 @@
-404: Not Found
+Unity Capture
+Copyright (c) 2018 Bernhard Schelling
+
+Based on UnityCam
+https://github.com/mrayy/UnityCam
+Copyright (c) 2016 MHD Yamen Saraiji
+
+The MIT License (MIT)
+
+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.