Open Source Licenses & Attribution
Last Updated: August 4, 2026ThePureLanguage is built on open source software and openly licensed data. This page collects the attribution and license notices those works require, in one place. It is a licensing page, not a privacy disclosure — for what data your browser sends to third parties, see our Privacy Policy, in particular Section 6 (Content Delivery Networks) and Section 19 (Analytics).
Every component listed here is used under a license that permits commercial use, including use on an advertising-supported website.
1. Chinese Character Stroke Data
The stroke-order animations on our Stroke Order Animator, radical pages, beginner games and certain articles are drawn from character data published by the Make Me a Hanzi project.
That data was derived from the Arphic PL KaitiM GB and Arphic PL UKai fonts, released by Arphic Technology Co., Ltd. under the Arphic Public License. We serve this data from our own servers, which makes us a redistributor of it, so the full license text is published alongside the data itself:
- Arphic Public License — full text as distributed with the data
- The same license in the Make Me a Hanzi repository
Make Me a Hanzi also publishes a character dictionary under the GNU Lesser General Public License, derived from Unihan and CJKlib. We do not use that dictionary — our definitions and pinyin come from our own dictionaries — so only the Arphic Public License applies here.
2. Software Libraries
| Component | Author | License |
|---|---|---|
| HanziWriter | David Chanin | MIT License |
| Bootstrap | The Bootstrap Authors | MIT License |
| jQuery | OpenJS Foundation | MIT License |
| jQuery Validation | Jörn Zaefferer | MIT License |
| jQuery Unobtrusive Validation | Microsoft | Apache License 2.0 |
| .NET and ASP.NET Core | Microsoft and the .NET Foundation | MIT License |
3. Icons
Interface icons come from Font Awesome Free by Fonticons, Inc. Font Awesome Free is released under three licenses, each covering a different part of the package:
- Icons — Creative Commons Attribution 4.0 International (CC BY 4.0), which requires the attribution given here.
- Fonts — SIL Open Font License 1.1.
- Code — MIT License.
The full terms are published at fontawesome.com/license/free.
4. Reference Data
HSK vocabulary lists follow the official syllabuses published by the Chinese Ministry of Education and its testing bodies. We are not affiliated with, endorsed by, or accredited under any of those organisations. Country IP range data used for traffic filtering is sourced from ipdeny.com.
5. Corrections
If you believe a work is used here without its required attribution, or is attributed incorrectly, please tell us via our contact page and we will correct it.