NOTICE

chatterbox.cpp
Copyright 2026 QVAC contributors

This product includes third-party components under their respective
licenses. chatterbox.cpp itself is licensed under MIT; bundled
dependencies are governed by the licenses listed below. Python packages
listed under Python Dependencies are optional and apply only to scripts/
(conversion and offline reference tooling), not to C++ inference binaries.

=========================================================================
Upstream model code
=========================================================================

--- mit (MIT License) ---

  Resemble Chatterbox (T3 + S3Gen + HiFT)
    https://github.com/resemble-ai/chatterbox
    The C++ port in src/chatterbox_*.cpp / src/t3_mtl.cpp /
    src/voice_features.cpp / src/voice_encoder.cpp / src/campplus.cpp /
    src/s3tokenizer.cpp re-implements the Resemble Chatterbox PyTorch
    inference path on top of ggml.

--- mit (MIT License) ---

  Supertonic (text encoder + duration + vector estimator + vocoder)
    https://huggingface.co/Supertone/supertonic
    The C++ port in src/supertonic_*.cpp re-implements the Supertonic
    ONNX inference path on top of ggml; the model weights themselves
    ship under their own license (consult the HuggingFace repo).

=========================================================================
C++ Dependencies
=========================================================================

--- mit (MIT License) ---

  ggml
    https://github.com/ggml-org/ggml
    Vendored under ggml/ at the pinned commit declared in
    scripts/setup-ggml.sh; chatterbox.cpp ships its local fixes as
    standalone patches under patches/ rather than maintaining a fork.

--- mit (MIT License) ---

  JSON for Modern C++ (nlohmann/json)
    src/json.hpp
    https://github.com/nlohmann/json
    Single-header build (v3.11.2) vendored for parsing external Supertonic
    voice JSON in src/supertonic_voice_json.cpp.

--- dual-license (Unlicense or MIT-0; recipient may choose either; see file) ---

  dr_wav (dr_libs)
    src/dr_wav.h
    https://github.com/mackron/dr_libs

--- apache-2.0-with-llvm-exception ---

  libc++ (LLVM C++ Standard Library), when linked (e.g. some Linux toolchains)
    https://github.com/llvm/llvm-project

=========================================================================
Python Dependencies
=========================================================================

--- apache-2.0 (Apache License 2.0) ---

  huggingface_hub
    https://github.com/huggingface/huggingface_hub
  onnx
    https://github.com/onnx/onnx
  resampy
    https://github.com/bmcfee/resampy
  safetensors
    https://github.com/huggingface/safetensors

--- bsd-3-clause ---

  numpy
    https://numpy.org/
  scipy
    https://scipy.org/
  torch (PyTorch)
    https://pytorch.org/

--- isc ---

  librosa
    https://librosa.org/

--- mit (MIT License) ---

  gguf
    https://pypi.org/project/gguf/
  Resemble Chatterbox (Python reference, used at conversion time)
    https://github.com/resemble-ai/chatterbox