Update README.md

README.md

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-license: cc-by-nc-sa-4.0
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+---
+license: cc-by-nc-sa-4.0
+tags:
+  - text-to-speech
+  - diffusion
+  - audio
+  - speech-synthesis
+---
+
+# Echo-TTS
+
+Echo-TTS is a diffusion-based text-to-speech model.  
+The weights in this repository are intended for **research and non-commercial use only**.
+
+---
+
+## License
+
+- **Model weights**: Released under **CC-BY-NC-SA-4.0**.
+- **Code**: The reference implementation and tooling live in a separate GitHub repository and are released under MIT (except where individual files specify otherwise).
+
+---
+
+## Responsible & Restricted Use
+
+By using this model, you agree **not** to use it for:
+
+- **Deception, fraud, or impersonation**, including:
+  - Generating audio that mimics a real person’s voice without their explicit consent.
+  - Creating deepfakes meant to mislead others about who is speaking.
+- **Harassment, abuse, or discrimination**, including targeted abuse or hate content generated in someone’s voice.
+- **Misinformation or political manipulation**, such as fabricated statements by public figures.
+- Any use that violates applicable laws or regulations.
+
+If you are unsure whether your use is allowed, please treat it as **not allowed** and err on the side of caution.
+
+---