Hanasuka incorporates third-party material under licence. These attributions are part of the terms of those licences and cannot be removed:
| Material | Source | Licence |
|---|---|---|
| Kanji readings, school grade and frequency | KANJIDIC2, by the Electronic Dictionary Research and Development Group (EDRDG) | CC BY-SA 4.0 |
| JLPT level of each kanji | Jonathan Waller's list (tanos.co.uk), as taken by kanjiapi.dev | Third-party reconstruction, not official |
| Interface icons | Font Awesome 6 Free, by Fonticons, Inc. | CC BY 4.0 |
| Zen Kaku Gothic New typeface | Google Fonts | SIL Open Font License 1.1 |
The CC BY-SA 4.0 licence of KANJIDIC2 extends to the derived dataset the application uses.