Quiz illustration credits
=========================

Author-created tutorial illustrations remain unchanged, including their
original use in the quizzes. New versions of the quiz-generated diagrams
follow the kirupa.com illustration guide:
https://www.kirupa.com/design/illustrations.htm

Twemoji
-------
Flat object artwork is from Twemoji v17.0.3, by Twitter, Inc. and other
contributors, licensed under Creative Commons Attribution 4.0 International:
https://github.com/jdecked/twemoji/tree/v17.0.3
https://creativecommons.org/licenses/by/4.0/

The icons have been arranged, resized, and sometimes rotated in new diagrams.
The alien has been recolored yellow and given an outline for Zorb. Diagram
layouts, labels, connectors, and data states have been composed for the quizzes.
The source inventory records each original icon URL and SHA-256 hash.

Category icons
--------------
The Pixel theme uses the original Twemoji icons from /icon/ under the license
above. Nature, Sci-Fi, Minimal, Ukiyo-e, and Platformer use original drawings,
not Twemoji edits. Each has a 22-icon sprite in quizzes/icons/. The editable
geometry and sprite exporter are in tools/quizzes/build_icons.mjs.

Typography
----------
Nunito: Copyright 2014 The Nunito Project Authors.
https://github.com/googlefonts/nunito
SIL Open Font License 1.1: https://openfontlicense.org/

Departure Mono: Copyright 2022-2024 Helena Zhang.
https://departuremono.com/
SIL Open Font License 1.1: https://openfontlicense.org/

Permanent Marker: Copyright 2010 Font Diner, Inc. All rights reserved.
https://github.com/google/fonts/tree/main/apache/permanentmarker
Apache License 2.0: https://www.apache.org/licenses/LICENSE-2.0

Question-diagram SVGs contain outlined letters, inline artwork, and white
artboards. They do not require installed fonts or load external resources.

Horizontal banner studies
-------------------------
The 20 concepts at /quizzes/visual-options.htm have light and dark variants
in quizzes/visuals/. Their editable compositions are in
tools/quizzes/build_visual_options.py. They contain no text or external resources.

Pixel compositions arrange, resize, and rotate Twemoji under CC BY 4.0, credited
above. Nature, Sci-Fi, Minimal, and Ukiyo-e compositions are original vector
drawings; the Ukiyo-e studies do not copy pixels from historical prints.

Platformer compositions embed the site's existing Kenney sprite sheet:
https://kenney.nl/assets/pixel-platformer
https://kenney.nl/assets/pixel-platformer-blocks
Both packs are CC0 1.0:
https://creativecommons.org/publicdomain/zero/1.0/
The site's cloud recoloring, flagpole assembly, and sprite-sheet changes are
documented in /ssi/newDesign/styles/platformer/LICENSES.txt. The banners arrange
these sprites in new scenes; the shared sprite sheet remains unchanged.

Editable sources
----------------
Drawing definitions, editable SVGs, the deterministic exporter, original-file
hashes, and third-party licenses are retained with the site's private source
for maintainers, under tools/quizzes/illustrations.

Historical figures
------------------
Current and earlier attempts retain the original kirupa.com tutorial artwork.
Earlier attempts also keep their original custom quiz diagrams. Frozen image
URLs and bytes have not been replaced.