# Raw data licensing and provenance notice

This dataset repository uses `license: other` because the included raw data does
not have one uniform declared license.

- Construction code in `hengyuf/diffusion-vs-ar` is distributed under the
  Apache License 2.0. That software license does not automatically relicense all
  third-party puzzle data.
- The original easy Sudoku CSV files are mirrored from the pinned
  `fhyfhy/diffusion-vs-ar-hard-sudoku` dataset snapshot.
- The `sudoku_extreme_*` files derive from `sapientinc/sudoku-extreme`, which
  combines several community benchmark sources and does not declare one uniform
  dataset license.

Files under `raw/` are unmodified research mirrors with byte-level provenance in
`metadata/raw_manifest.json`. Their inclusion here does not grant rights beyond
those provided by their respective upstream sources. Users are responsible for
reviewing and complying with the upstream terms before redistribution or use,
especially outside research contexts.

Upstream references:

- https://huggingface.co/datasets/fhyfhy/diffusion-vs-ar-hard-sudoku
- https://huggingface.co/datasets/sapientinc/sudoku-extreme
- https://github.com/hengyuf/diffusion-vs-ar/tree/hard-sudoku-datasets