Key Music third-party software QR Code generator library, Copyright (c) Project Nayuki. https://www.nayuki.io/page/qr-code-generator-library MIT License; full notice: LICENSE-qrcodegen.txt. Also retained in the source. The TypeScript source is transpiled to JavaScript and an ES-module export is added. jsQR, https://github.com/cozmo/jsQR Apache License 2.0. Full license: LICENSE-jsQR.txt. The distributed JavaScript is wrapped with a local CommonJS module object and an ES-module default export. The QR decoding implementation is unchanged. No music is included. Test tones are generated locally by scripts/generate_fixtures.py. Noto Sans KR, Copyright 2014-2021 Adobe. Source: https://github.com/google/fonts/tree/main/ofl/notosanskr SIL Open Font License 1.1; full notice: LICENSE-NotoSansKR.txt. A local WOFF2 subset covers the app UI and basic Latin. Other song names use the device fallback font. No external font request is made. Player icons and empty-library illustration are exported from the user-provided Figma design 0uNyrKDUSmjMRNS7rPeo7k. Album images in that design are samples; user music uses its embedded artwork or the default music cover.