# moSHion Licensing moSHion is an original engine written for this course, inspired by q5play. It contains no q5play source code. The sections below cover each file in `public/moshion/`. ## 1. moshion.js, moshion.d.ts, runner.html, assets/ — MIT The moSHion engine facade, its type declarations, the sandbox host and the example sprite sheets are original work written for this course and released under the MIT license: ``` MIT License Copyright (c) 2026 Steven Huff Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ``` ## 2. planck.min.js — MIT (upstream) `planck.min.js` is planck.js v1.5.0, vendored unmodified. Its license header (kept intact in the file) reads: ``` Planck.js v1.5.0 @license The MIT license @copyright Copyright (c) 2026 Erin Catto, Ali Shakiba Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ``` ## 3. Design attribution moSHion is inspired by [q5play][] (created by Quinton Ashley), which this course previously used. The engine is an original implementation over planck.js: it contains no q5play source code and is not subject to the q5play Creator License or its CS-education restriction. [q5play]: https://q5play.org ## 4. A note on `assets/` Until 2026-08-25 this directory held six files that were **byte-identical** to the example art shipped with q5play, while section 1 above described them as original work for this course. That was not correct. They were replaced with art generated by `scripts/make-moshion-assets.py`, which draws every pixel from primitives and reads no source image. The sheet geometry is unchanged, because the lessons that load them slice by frame count: `asterisk_explode.avif` 11 frames, `ghost_idle.avif` 7, `ghost_fly.avif` 4, and `star.webp` a single static image. `monster.webp` and `questKid.webp` were deleted rather than redrawn -- no lesson, doc or example referenced either one. Re-run the script to regenerate the sheets; it is deterministic. ## 5. `textures/` — CC0 (Kenney) `textures/` is the catalog behind `sprite.texture = 'coin'`. It is **not** original work for this course, and section 1 does not cover it. | | | | --- | --- | | Pack | Kenney, *Platformer Art: Pixel Redux*, created 2020-04-22 | | Author | Kenney (kenney.nl) | | License | **CC0 1.0 Universal** — public domain dedication | | Source | `github.com/ETdoFresh/kenney.nl`, `platformerart_pixelredux_2` | | Sheet | `Tilemap/tilemap_packed.png`, sha256 `883071fc…99bdc78`, 630×630 | The pack's own `License.txt` reads: *"This content is free to use in personal, educational and commercial projects."* CC0 requires no attribution; crediting Kenney is optional and encouraged. That license file is vendored twice on purpose — beside the source sheet in `scripts/assets/kenney-pixel-redux/`, and beside the sliced output in `textures/LICENSE.txt` — so the provenance travels with the bytes in either direction. Each of the 40 PNGs is an **exact 21×21 crop** of that sheet. Nothing is redrawn, recoloured or modified. `scripts/make-textures.py` holds the name → tile-index table and is deterministic: re-running it reproduces every file. Adding a texture means adding a row to that table and re-running, never dropping a PNG into the directory by hand — `scripts/check-textures.mjs` fails on a file the manifest does not name. If a future texture comes from somewhere else, it needs its own row and its own section, not a quiet addition to this one. ### Student-saved textures `saveTexture(name, dataUrl)` stores art a student drew, in that student's own browser storage. It never touches this directory, is never committed, and carries no license claim by this project. ## 6. Original art in `assets/` and `textures/` `textures/runner.png`, `textures/runnerJump.png`, `assets/ground_tile.png` and `assets/grass_tile.png` are original work, drawn pixel by pixel from `scripts/make-runner-sheet.py` and `scripts/make-ground-tiles.py` (both deterministic, neither reads a source image), and are MIT like section 1. They sit in the `textures/` catalog beside the Kenney crops but are not covered by section 5; `make-textures.py` lists them separately as `ORIGINAL`. The `*Walk`, `*Fly`, `*Swim` and `*Crawl` strips are Kenney tiles placed side by side, still exact crops with nothing redrawn.