Data sources and licenses
Reference pages on this site are built from the datasets below. Every record keeps its source, license and retrieval date; data without a known license is not used.
CC-CEDICT
- Publisher
- MDBG and CC-CEDICT contributors
- Website
- https://www.mdbg.net/chinese/dictionary?page=cc-cedict
- License
- CC BY-SA 4.0
- Used for
- Chinese words, pinyin and English definitions
Unihan Database
- Publisher
- Unicode, Inc.
- Website
- https://www.unicode.org/charts/unihan.html
- License
- Unicode License v3
- Used for
- character readings, radicals, stroke counts, variants
KANJIDIC2
- Publisher
- Electronic Dictionary Research and Development Group (EDRDG)
- Website
- https://www.edrdg.org/wiki/index.php/KANJIDIC_Project
- License
- CC BY-SA 4.0
- Used for
- kanji meanings, on/kun readings, grade, JLPT level
JMdict
- Publisher
- Electronic Dictionary Research and Development Group (EDRDG)
- Website
- https://www.edrdg.org/wiki/index.php/JMdict-EDICT_Dictionary_Project
- License
- CC BY-SA 4.0
- Used for
- Japanese words, readings and English glosses
Make Me a Hanzi
- Publisher
- Shaunak Kishore and contributors
- Website
- https://github.com/skishore/makemeahanzi
- License
- Arphic Public License (graphics.txt); LGPL-3.0-or-later (dictionary.txt)
- Used for
- Chinese stroke order animations, decomposition, etymology
KanjiVG
- Publisher
- Ulrich Apel and KanjiVG contributors
- Website
- https://kanjivg.tagaini.net/
- License
- CC BY-SA 3.0
- Used for
- Japanese kanji stroke order animations
wordfreq
- Publisher
- Robyn Speer
- Website
- https://github.com/rspeer/wordfreq
- License
- CC BY-SA 4.0 (data)
- Used for
- English word frequency list (which words get symbol pages)
English Wikisource
- Publisher
- Wikisource contributors
- Website
- https://en.wikisource.org/
- License
- Public domain texts; transcription CC BY-SA 4.0
- Used for
- public-domain translations by James Legge (1861-1891) and Lionel Giles (1889, 1910)
Chinese Wikisource
- Publisher
- Wikisource contributors
- Website
- https://zh.wikisource.org/
- License
- Public domain texts; transcription CC BY-SA 4.0
- Used for
- original Classical Chinese texts
Project Gutenberg
- Publisher
- Project Gutenberg volunteers
- Website
- https://www.gutenberg.org/
- License
- Public domain in the USA
- Used for
- public-domain books
Wikidata
- Publisher
- Wikidata contributors
- Website
- https://www.wikidata.org/
- License
- CC0 1.0
- Used for
- facts about fighters, styles, techniques, weapons, films, competitions
Wikipedia (English)
- Publisher
- Wikipedia contributors
- Website
- https://en.wikipedia.org/
- License
- CC BY-SA 4.0
- Used for
- article lead extracts and tables (quoted with a link to the article)
Wikiquote (English)
- Publisher
- Wikiquote contributors
- Website
- https://en.wikiquote.org/
- License
- CC BY-SA 4.0
- Used for
- sourced quotations
Wikimedia Commons
- Publisher
- Commons contributors (per file)
- Website
- https://commons.wikimedia.org/
- License
- Per file (only free licenses used)
- Used for
- images (license and author shown with each image)
OpenStreetMap
- Publisher
- OpenStreetMap contributors
- Website
- https://www.openstreetmap.org/
- License
- ODbL 1.0
- Used for
- martial arts schools and gyms in the USA
County Business Patterns
- Publisher
- U.S. Census Bureau
- Website
- https://www.census.gov/programs-surveys/cbp.html
- License
- Public domain (U.S. Government work)
- Used for
- number of sports and recreation instruction establishments (NAICS 611620) by county and state
Census Gazetteer Files
- Publisher
- U.S. Census Bureau
- Website
- https://www.census.gov/geographies/reference-files/time-series/geo/gazetteer-files.html
- License
- Public domain (U.S. Government work)
- Used for
- county and place names, population-free geography
PubMed
- Publisher
- U.S. National Library of Medicine
- Website
- https://pubmed.ncbi.nlm.nih.gov/
- License
- NLM citation data, free to use (abstracts not reproduced)
- Used for
- study titles, journals, years, publication types (citation metadata only)
ClinicalTrials.gov
- Publisher
- U.S. National Library of Medicine
- Website
- https://clinicaltrials.gov/
- License
- Public domain (U.S. Government work)
- Used for
- registered clinical trials of tai chi and qigong
NCCIH
- Publisher
- National Center for Complementary and Integrative Health
- Website
- https://www.nccih.nih.gov/
- License
- Public domain (U.S. Government work)
- Used for
- links to government health information
Adult Compendium of Physical Activities (2024)
- Publisher
- Herrmann SD et al.
- Website
- https://pacompendium.com/
- License
- Free to use, including commercially, with citation; MET values unchanged (terms on pacompendium.com)
- Used for
- MET values for calorie estimates
bjj-data (Grapple Flows)
- Publisher
- Grapple Flows (grappleflows.com)
- Website
- https://github.com/grapple-flows/bjj-data
- License
- CC BY 4.0
- Used for
- BJJ weight classes, legal techniques by ruleset and division, IBJJF age divisions and belt requirements (reformatted into tables; rules belong to the organizations that publish them)
Subskills sports technique taxonomy
- Publisher
- Subskills (subskills.xyz)
- Website
- https://github.com/ihvou/subskills-taxonomy
- License
- CC BY 4.0
- Used for
- learning order and level of BJJ, boxing and Muay Thai skills
King's Kung-Fu and Tai Chi
- Publisher
- King's Kung-Fu and Tai Chi
- Website
- https://kingskungfu.com/
- License
- Owner's content (all rights reserved)
- Used for
- original school pages
Notes on attribution
- Text quoted from Wikipedia and Wikiquote is available under the Creative Commons Attribution-ShareAlike 4.0 License; each quoted passage links to its source article.
- School data © OpenStreetMap contributors, available under the Open Database License (ODbL).
- Wikidata facts are CC0. Census Bureau, National Library of Medicine and NCCIH material is in the public domain.
- Translations of the classics are by James Legge (1861–1891), Lionel Giles (1910) and Herbert A. Giles (1889) and are in the public domain.
- Stroke order data: Make Me a Hanzi (Arphic Public License / LGPL) and KanjiVG (CC BY-SA 3.0).