# Attribution

This project uses the [wordfreq](https://pypi.org/project/wordfreq/) Python library developed by Robyn Speer and Luminoso Technologies, Inc.

## Library License

The `wordfreq` code is licensed under the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0).

## Data License

The word frequency data used by `wordfreq` is licensed under the [Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA 4.0)](https://creativecommons.org/licenses/by-sa/4.0/).  
If you reuse or modify the data, you must also share it under the same license and give proper credit.

## Citation

If you use this data in published work, please cite:

> Robyn Speer. (2022). *rspeer/wordfreq: v3.0 (v3.0.2)*. Zenodo. [https://doi.org/10.5281/zenodo.7199437](https://doi.org/10.5281/zenodo.7199437)

## Original Data Sources Used by `wordfreq`

The `wordfreq` project integrates and processes data from multiple sources, including:

- SUBTLEX word lists
- Wikipedia and Wiktionary corpora
- OpenSubtitles
- Google Books Ngrams (for some languages)

Each of these may have their own licensing terms; consult [wordfreq’s GitHub repo](https://github.com/LuminosoInsight/wordfreq) for full details.

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This attribution file is provided in compliance with open data and software licensing obligations.