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+# License
+
+This repository contains data from multiple sources with different licenses.
+
+## Our Work (MIT)
+
+Original integration, curation, and derived datasets are released under the MIT License:
+
+- `world_languages_integrated.json` (integration of multiple sources)
+- `language-families/` (curated family trees, PIE reconstructions)
+- `lemmatization/` (historical lemma mappings)
+- All `*_metadata.json` companion files
+
+Copyright (c) 2026 Luke Steuber
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files, to deal in the Software
+without restriction, including without limitation the rights to use, copy,
+modify, merge, publish, distribute, sublicense, and/or sell copies, 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.
+
+## Glottolog (CC-BY-4.0)
+
+Files: `glottolog_coordinates.json`, `glottolog_languoid.csv`
+
+Hammarstrom, Harald & Forkel, Robert & Haspelmath, Martin & Bank, Sebastian. 2024.
+Glottolog 5.0. Leipzig: Max Planck Institute for Evolutionary Anthropology.
+https://glottolog.org
+
+Licensed under Creative Commons Attribution 4.0 International (CC-BY-4.0).
+https://creativecommons.org/licenses/by/4.0/
+
+## WALS (CC-BY-4.0)
+
+Files: `wals_languages.csv`, `wals_parameters.csv`, `wals_values.csv`
+
+Dryer, Matthew S. & Haspelmath, Martin (eds.) 2013.
+WALS Online (v2020). Leipzig: Max Planck Institute for Evolutionary Anthropology.
+https://wals.info
+
+Licensed under Creative Commons Attribution 4.0 International (CC-BY-4.0).
+https://creativecommons.org/licenses/by/4.0/
+
+## PHOIBLE (CC-BY-SA-3.0)
+
+Files: `phoible.csv`
+
+Moran, Steven & McCloy, Daniel (eds.) 2019.
+PHOIBLE 2.0. Jena: Max Planck Institute for the Science of Human History.
+https://phoible.org
+
+Licensed under Creative Commons Attribution-ShareAlike 3.0 Unported (CC-BY-SA-3.0).
+https://creativecommons.org/licenses/by-sa/3.0/
+
+**Note:** The share-alike requirement means any derivative work incorporating PHOIBLE data
+must also be released under CC-BY-SA-3.0 or a compatible license.
+
+## Joshua Project (Public API)
+
+Data in `world_languages_integrated.json` includes population and demographic data
+from the Joshua Project public API (https://joshuaproject.net). Used under their
+public API terms.
+
+## Brown Corpus (Public Domain)
+
+Files: `reference-corpora/brown_corpus_stats.csv`
+
+Summary statistics derived from the Brown University Standard Corpus of Present-Day
+American English. The Brown Corpus itself is in the public domain.