WriteSheet Japanese kana stroke data uses KanjiVG.
KanjiVG: Copyright (C) 2009/2010/2011 Ulrich Apel and contributors.
Project: https://kanjivg.tagaini.net/
Source: https://github.com/KanjiVG/kanjivg/tree/70a0b7ae0c18ceb5cb358274b029cce0234a43bc
License: Creative Commons Attribution-Share Alike 3.0 Unported (CC BY-SA 3.0).
https://creativecommons.org/licenses/by-sa/3.0/

WriteSheet adaptation (2026-10-12): selected the 46 basic hiragana and 46 basic
katakana; preserved all pen strokes, order, direction and cubic centerlines;
expanded relative SVG commands to absolute M/C commands; uniformly scaled the
109-unit canvas to 100 units and reflected its y coordinate into y-up form
(x' = x * 100 / 109; y' = 100 - y * 100 / 109), rounded to six decimals.
No font outlines, inferred pen lifts or reordered strokes are used.
The adapted data in static/japanese-strokes.js and the included original SVG
source collection are distributed under CC BY-SA 3.0, with no endorsement
by the original authors. Attribution, this change notice and the full license
must accompany redistributions and adaptations as required by that license.
The original collection is in static/licenses/KanjiVG-kana-source.json.
The unmodified upstream COPYING text is in static/licenses/CC-BY-SA-3.0-KanjiVG.txt.