Open Source Licences

Several tools here are thin wrappers around software other people wrote and gave away. This page records whose work it is and the terms it is used under.

Excalidraw

The whiteboard is Excalidraw, used under the MIT licence. The drawing engine, the hand-drawn rendering and the fonts are their work, not ours.

  • @excalidraw/excalidraw — MIT, as declared in the package manifest.
  • @excalidraw/laser-pointer — Copyright (c) 2023 Excalidraw
  • @excalidraw/mermaid-to-excalidraw — Copyright (c) 2023 Excalidraw
  • @excalidraw/markdown-to-text — Copyright (c) 2020 Daniel Esteves
  • @excalidraw/random-username — Copyright (c) 2021 dwelle

Excalidraw is a trademark of its owners. Hobby Time is not affiliated with, sponsored by, or endorsed by Excalidraw. The upstream source and its licence file are at github.com/excalidraw/excalidraw.

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.

Fonts served with the whiteboard

Excalidraw would otherwise fetch its fonts from a third-party CDN while you draw. We copy them into this site at build time and serve them from this domain instead, so that using the whiteboard does not tell anyone else you are using it. That means these font files are redistributed here:

  • Assistant
  • Cascadia
  • ComicShanns
  • Excalifont
  • Liberation
  • Lilita
  • Nunito
  • Virgil
  • Xiaolai

These families ship inside the Excalidraw package and carry their own upstream terms, which are being confirmed family by family and will be reproduced here. If you are one of their authors and something on this page is wrong, please tell us and we will correct it.