# Third-party notices

SDRPulse includes or is derived from the following third-party work.

## Source code

### pl_mpeg — MPEG-1 Audio Layer II decoder (ported to C#)
`src/SDRPulse.Core/Dab/Mp2Decoder.cs` is a C# port of the MP2 decoder in pl_mpeg
(https://github.com/phoboslab/pl_mpeg), which is itself based on kjmp2 by Martin J. Fiedler.
SDRPulse changes: requantisation follows ISO/IEC 11172-3 (levels divided by L instead of L+1), with
the output level calibrated accordingly.

```
MIT License

Copyright (c) 2019 Dominic Szablewski - https://phoboslab.org

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.
```

## Data

- **Natural Earth** 1:110m coastline (`src/SDRPulse.App/Assets/coastline.txt`) and 1:50m land, lakes, rivers, borders, roads and populated places (`src/SDRPulse.App/Assets/worldmap.bin`, the offline world map) — public domain, https://www.naturalearthdata.com
- **SatNOGS DB** transmitter data (downloaded at run time, cached) — CC BY-SA 4.0, https://db.satnogs.org
- **CelesTrak** orbital elements (downloaded at run time, cached) — https://celestrak.org

## Models (bundled)

- **Silero VAD** (`silero_vad.onnx`) — MIT License, https://github.com/snakers4/silero-vad
- **DeepFilterNet3** (`deepfilternet3.onnx`) — MIT / Apache-2.0, https://github.com/Rikorose/DeepFilterNet

## Libraries (NuGet)

Avalonia (MIT), CommunityToolkit.Mvvm (MIT), Microsoft.Data.Sqlite (MIT), Microsoft.ML.OnnxRuntime (MIT),
Microsoft.ML.Tokenizers (MIT), NAudio.WinMM (MIT), Velopack (MIT), Whisper.net and whisper.cpp (MIT).

## FFmpeg (DAB+ audio)

SDRPulse ships unmodified FFmpeg libraries (`codecs\avcodec-63.dll`, `avutil-61.dll`, `swresample-7.dll`) under the
**GNU Lesser General Public License v2.1 or later** (LGPL build; full text in `codecs\FFMPEG-LICENSE.txt`). They are
loaded at run time only and can be replaced with any compatible build. Binaries: BtbN FFmpeg-Builds (win64,
lgpl-shared); the exact FFmpeg version is in `codecs\VERSION.txt` (the build shipped now is FFmpeg git commit
9d3f0f2c58: https://github.com/FFmpeg/FFmpeg/tree/9d3f0f2c58, build scripts: https://github.com/BtbN/FFmpeg-Builds).
The complete corresponding source is available from sdrpulse.cc next to the download, and on request from contact@sdrpulse.cc for at least three years. FFmpeg is a trademark of Fabrice Bellard.

A user-supplied Fraunhofer FDK AAC library (`libfdk-aac-2.dll` in `%APPDATA%\SDRPulse\codecs`) is used instead
when present; it is not distributed with SDRPulse.

Protocol knowledge was cross-checked against public documentation and open-source decoders (dab-cmdline, slowrx,
SatDump, dumpvdl2, multimon-ng); no code from those GPL projects is included.