Penumbra is distributed under a dual-licensing model:

1. Color Palettes, Themes, Swatches, and Documentation (MIT License)
   All generated color palettes (including penumbra_base.tsv and penumbra_accents.tsv),
   color specifications, swatch graphics, exported editor and terminal themes,
   documentation, and assets are licensed under the MIT License:

   Copyright (c) 2021-2026 Neal McKee

   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.

2. Source Code and Generator Scripts (PolyForm Noncommercial License 1.0.0)
   All algorithmic color appearance modeling (CAM) code, optimization solvers,
   and generation scripts located in src/ and scripts/ are licensed under the
   PolyForm Noncommercial License 1.0.0.

   See src/LICENSE-POLYFORM.txt for the full license terms.

3. Bundled Fonts (SIL Open Font License 1.1)
   The Fira Sans and Fira Code font files in fonts/ (used to render the swatch
   and code example graphics) are licensed under the SIL Open Font License 1.1.

   See fonts/OFL.txt for the full license terms.