Licenses and credits
3D opponents
The 3D opponent characters are based on the Microsoft Rocketbox Avatar Library, used under the MIT License:
MIT License Copyright (c) 2020 Microsoft 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.
Software libraries
- three.js, MIT License, used to draw the 3D opponents:
MIT License Copyright © 2010-2026 three.js authors 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.
- LiveKit client, Apache License 2.0, used for live video: license text.
- Microsoft Azure Speech SDK for JavaScript, © Microsoft Corporation, used for voice and lip-sync: license and third-party notices.
Portraits of historical figures
Portraits are shown as illustrations only. The AI voices and personalities are our own interpretations and are not endorsed by, or affiliated with, the people or estates depicted. Portraits that require credit:
| Figure | Author | License | Source |
|---|---|---|---|
| Marcus Aurelius | Daniel Martin | CC BY-SA 4.0 | Wikimedia Commons |
| Eleanor Roosevelt | FDR Presidential Library & Museum | CC BY 2.0 | Wikimedia Commons |
| Christopher Hitchens | ensceptico | CC BY 2.0 | Wikimedia Commons |
Images are cropped for display. The other portraits are in the public domain or released under CC0.