KorvaTTS
Copyright 2026 dogenthq

This product is licensed under the Apache License, Version 2.0 (see LICENSE).
Model weights are licensed separately; see MODEL_LICENSE.md.

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Third-party components and acknowledgements
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1. Supertonic (https://github.com/supertone-inc/supertonic)
   Copyright (c) 2025 Supertone Inc. — MIT License.

   KorvaTTS implements the Supertonic 3 model architecture (SupertonicTTS, Kim et al.,
   arXiv:2503.23108) and keeps its ONNX interface and voice-style file format so that the
   published assets stay interchangeable with Supertonic runtimes. Portions of the inference
   pipeline in `korvatts/` (text normalization rules, latent sampling, ONNX execution order)
   are adapted from the Supertonic Python example code. The KorvaTTS weights were trained
   from scratch and are not derived from Supertonic's model weights.

2. BlueTTS (https://github.com/maxmelichov/BlueTTS)
   Copyright (c) Max Melichov — MIT License.

   The KorvaTTS vocoder follows the BlueCodec design from BlueTTS.

3. PhoAudiobook (https://huggingface.co/datasets/thivux/phoaudiobook)
   Vietnamese audiobook speech corpus introduced in "Zero-Shot Text-to-Speech for Vietnamese"
   (ACL 2025). Used as training data.

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MIT License text (applies to items 1 and 2 above)
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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.

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"Supertonic" and "Supertone" are trademarks of Supertone Inc. KorvaTTS is an
independent project and is not affiliated with or endorsed by Supertone Inc.
