# Attribution & licenses

Nihongo is built on open Japanese-language datasets. The learning content it
ships (vocabulary, kanji, example sentences, and JLPT level groupings) is
derived from the projects below. Each is used under an open license that
requires attribution; those obligations are honored here, in the on-site
`/licenses` page, and by the persistent dictionary-data credit in the site
footer.

Generated content lives under `public/content/v1/`. The KanjiVG-derived stroke
data ships with its own `LICENSE` file in `public/content/v1/kanji-svg/`
(CC BY-SA share-alike on the derivative).

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## JMdict & KANJIDIC2

- **What we use:** Vocabulary entries (kanji, kana, part of speech, English
  glosses) from JMdict, and kanji data (on/kun readings, English meanings,
  stroke counts) from KANJIDIC2.
- **Copyright holder:** These files are the property of the Electronic
  Dictionary Research and Development Group (EDRDG) and are used in conformance
  with the Group's licence.
- **License:** [CC BY-SA 4.0](https://www.edrdg.org/edrdg/licence.html)
  (the EDRDG licence).
- **Source:** Consumed via the
  [jmdict-simplified](https://github.com/scriptin/jmdict-simplified) JSON
  distribution, which repackages the EDRDG data. EDRDG:
  [www.edrdg.org](https://www.edrdg.org/).

## KanjiVG

- **What we use:** Per-kanji SVG stroke paths and stroke-order metadata, used to
  render the writing animations.
- **Copyright holder:** © Ulrich Apel.
- **License:**
  [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/). Share-alike:
  our derived stroke JSON keeps its own CC BY-SA notice.
- **Source:** [kanjivg.tagaini.net](https://kanjivg.tagaini.net).

## Tatoeba

- **What we use:** Japanese example sentences with translations (text only).
  Each sentence's Tatoeba ID is retained in our content files for per-sentence
  attribution.
- **Copyright holder:** The Tatoeba Project and its contributors.
- **License:** [CC BY 2.0 FR](https://creativecommons.org/licenses/by/2.0/fr/)
  (some sentences are CC0).
- **Source:** [tatoeba.org](https://tatoeba.org).

## JLPT level lists

- **What we use:** Assignment of vocabulary, kanji, and grammar to JLPT levels
  N5–N3.
- **Copyright holder:** Jonathan Waller (tanos.co.uk).
- **License:** [CC BY](https://creativecommons.org/licenses/by/4.0/). The
  tanos.co.uk source states Creative Commons Attribution without a version
  number.
- **Source:** [tanos.co.uk/jlpt](https://www.tanos.co.uk/jlpt/); GitHub mirror
  [elzup/jlpt-word-list](https://github.com/elzup/jlpt-word-list) (which derives
  from the Tanos lists).

## N3 kanji list

- **What we use:** The set of kanji assigned to JLPT N3 — the literals only;
  readings, meanings, and stroke counts come from KANJIDIC2.
- **Copyright holder:** Compiled by mund-tandem.com (the site is no longer
  online), and distributed by Jonathan Waller as part of the tanos.co.uk JLPT
  resources. Tanos publishes no N3 kanji list of its own.
- **License:** [CC BY](https://creativecommons.org/licenses/by/4.0/) — the
  Creative Commons Attribution terms tanos.co.uk states for its JLPT materials.
- **Source:** [tanos.co.uk/jlpt/jlpt3](https://www.tanos.co.uk/jlpt/jlpt3/)
  (`kanji/mund/jlpt_n3_kanji.txt`).

---

## JLPT disclaimer

The JLPT level lists are community-sourced and **unofficial**. Since the 2010
reform, the Japan Foundation no longer publishes content specifications for each
level, so the N5–N3 assignments here are community estimates and may contain
errors.