# Underdog Non-Commercial License 1.0 Copyright 2026 Conway ("Underdog", "we", "us"). This license covers each model Underdog releases under it, as named in that model's card (for example, Underdog Woof). By downloading, running, copying or building on the Model, you ("you") agree to these terms. ## The short version - **Free for non-commercial use.** Personal projects, research, teaching and non-profits can use the Model and publish what it makes. - **Credit Underdog.** Put "Underdog Woof" or "underdog.ai" in the title or description of anything you publish with its audio, and show "Voice by Underdog Woof" in any app or product that uses it. - **Commercial use needs a license.** Using the Model or its audio in a paid product, an ad, a monetized video, a company's work or anything else that earns money needs a commercial license: license@conway.tech. - **No training on Woof.** Don't use the Model or its audio to train, fine-tune or distill another model that makes speech or audio. - **Free inside Underdog.** Using the Model through underdog.ai and Underdog's own apps is always free. The terms below are the full license. Where they differ from this summary, the terms below apply. ## 1. Definitions - **Model**: the weights, code, configuration, voices and documentation we release under this license, in any format. - **Outputs**: audio or other content made with the Model or a Derivative. - **Derivative**: any modified version of the Model, including fine-tunes, merges and converted versions; any model created, initialized, improved or trained, in whole or in part, from the Model's weights, activations or Outputs; and any dataset made up of, or built mainly from, Outputs. - **Commercial Use**: any use by or for a company or other for-profit organization, and any use that earns money or supports something that does, directly or indirectly. This includes using the Model or Outputs in a paid or ad-supported product or service, in advertising or sponsored or monetized content, as a hosted service or API, and in a business's internal operations. - **Non-Commercial Use**: personal projects, academic research, teaching, and work by non-profit organizations, in each case where nothing is sold, licensed or monetized. - **Underdog Products**: underdog.ai and the apps, services and features that Underdog itself operates. ## 2. What you may do for free Subject to these terms, we grant you a worldwide, non-exclusive, non-transferable, royalty-free license to use, run, copy and modify the Model, to share the Model and your modified versions of it, and to use and publish Outputs, for Non-Commercial Use only. Anyone may also use the Model free of charge through Underdog Products, including for commercial purposes. That covers the product as we provide it, not taking the Model out of an Underdog Product to run it elsewhere. A company may test the Model internally for up to 30 days to decide whether to buy a commercial license. Testing means trying it out, not running it in production or for customers. ## 3. Commercial Use needs a commercial license Any Commercial Use of the Model, a Derivative or Outputs requires a separate written commercial license from Underdog. Write to license@conway.tech. Without one, this license grants no commercial rights. ## 4. Credit If you use the Model or a Derivative under this license, you must credit Underdog: - **Published audio.** When you publish or share Outputs, include "Underdog Woof" or "underdog.ai" in the title or description where the audio is posted. - **Apps and products.** Wherever Outputs are played or the feature is offered, show "Voice by Underdog Woof" with a link to underdog.ai, where users can see it. An audio-only product puts it in its about or settings screen and in its listing. - **Model cards, READMEs, papers and listings.** Say that the work is, or is derived from, Underdog Woof, and link to this license. - **Sharing the Model or a modified version.** Include this license and the NOTICE file unchanged, and say what you changed. A commercial license may set different credit terms in writing. ## 5. Outputs and training As between you and Underdog, you own the Outputs you make, to the extent the law allows, and you may use them for Non-Commercial Use under this license, or for Commercial Use under a commercial license. You may not use the Model, a Derivative or any Outputs to train, fine-tune, distill or otherwise improve any other model that generates speech or audio, unless a commercial license from Underdog allows it. Every Derivative is covered by this license; if you share one, you must share it under this license, and you may not add terms that take away any of these conditions. Outputs may not be unique, and the Model may make the same or similar Outputs for others. You are responsible for your inputs and your Outputs. Underdog does not review Outputs and makes no promise about their accuracy or fitness for any purpose. ## 6. Responsible use Don't use the Model, a Derivative or Outputs to impersonate a real person without their consent, to deceive people about whether they are hearing a machine, to commit fraud, or for anything illegal. Don't use them to clone or imitate a real person's voice without that person's consent. Follow all laws that apply to your use. ## 7. Third-party components Parts of the Model come from work by others under their own licenses, listed in the NOTICE file. Underdog Woof's audio decoder is adapted from Kyutai's Mimi, and its training data includes LibriTTS-R and Emilia-YODAS, all CC-BY 4.0. This license doesn't restrict any rights you have in those works under their own licenses, and you must follow those licenses too. ## 8. Names and trademarks This license doesn't grant permission to use Underdog's names, logos or trademarks, except for the credit in section 4 and for reproducing the NOTICE file. Don't suggest that Underdog endorses, sponsors or is affiliated with you or your product. ## 9. Ending the license If you break these terms, your rights under this license end automatically. If it is your first breach and you fix it within 30 days of learning about it, your rights come back. If you sue anyone claiming that the Model infringes your rights, your license ends on the day you file. ## 10. No warranty; limited liability Unless required by applicable law or agreed to in writing, Underdog provides the Model, its Outputs and any Derivative "AS IS", WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for deciding whether to use the Model and assume all risks of doing so. IN NO EVENT AND UNDER NO LEGAL THEORY, WHETHER IN TORT (INCLUDING NEGLIGENCE), CONTRACT OR OTHERWISE, UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING, WILL UNDERDOG BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM THIS LICENSE OR FROM THE USE OR INABILITY TO USE THE MODEL, ITS OUTPUTS OR ANY DERIVATIVE, EVEN IF UNDERDOG HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. ## 11. General This license is governed by the laws of California, and disputes go to the courts of San Francisco County. If part of it can't be enforced, the rest still applies. We may publish new versions of this license; a Model released under a version stays available to you under that version. Questions and commercial licensing: license@conway.tech.