# Licensing

This dataset combines two layers under **different** licenses. Read both before reuse.

## 1. Tooling and packaging — Apache-2.0

The database schema, the FAISS index, the BM25 index, the embeddings, the Parquet packaging,
and this dataset card are released under the **Apache License 2.0**, consistent with the
canonical Zenodo record (DOI [10.5281/zenodo.20586256](https://doi.org/10.5281/zenodo.20586256)).

## 2. Source snippets (the `code` field) — upstream free/open-source licenses

The `code` values in `snippets.db` and in the Parquet shards are **excerpts derived from upstream
MediaWiki / Wikimedia repositories**. Each excerpt remains under **the license of its origin
repository** — predominantly **GPL-2.0-or-later**, with some MIT, BSD, Apache-2.0, and others.
The Apache-2.0 grant in section 1 does **not** relicense this upstream code.

There is **no per-row `license` column** in the data. Instead, **every entity carries a Software
Heritage identifier (`swhid`)** with an `origin=` qualifier (and `lines=` range). This lets you
resolve the exact upstream repository, revision, and file — and therefore the authoritative
license and copyright — via:

- Software Heritage: <https://archive.softwareheritage.org/>
- the `origin=` repository URL embedded in each SWHID.

## Caveats

- Snippets are **fragments** (individual functions, types, or templates) and may not carry the
  original file's license header or copyright notice. **Consult the origin repository before
  redistributing or reusing** a snippet.
- If you are a copyright holder and believe a snippet should not be redistributed here, please
  open an issue on the GitHub repository
  (<https://github.com/ftosoni/mediawiki-code2code-search>) or contact the author; it will be
  removed promptly.

## Summary

| Layer | License |
|---|---|
| Schema, indexes, embeddings, packaging, card | Apache-2.0 |
| `code` snippets | Upstream FOSS licenses (predominantly GPL-2.0-or-later); resolve per entity via `swhid` |