# Third-party software and source availability

SpeedUpSongs performs audio processing with the following unmodified libraries. This record documents technical provenance and redistribution materials; owner licensing review remains required before public distribution.

| Software | Installed version | License | Source |
| --- | --- | --- | --- |
| SoundTouchJS audio-worklet, core, worklet-base, interpolation-strategy-lanczos | 2.1.1 each | MPL-2.0 | https://github.com/cutterbl/SoundTouchJS |
| Mediabunny | 1.65.2 | MPL-2.0 | https://github.com/Vanilagy/mediabunny |
| @mediabunny/mp3-encoder | 1.65.2 | MPL-2.0, includes LAME below | https://github.com/Vanilagy/mediabunny/tree/main/packages/mp3-encoder |
| LAME MP3 Encoder | 3.100 | LGPL version 2 or later | https://lame.sourceforge.io/ |
| Astro | 7.4.11 | MIT | https://github.com/withastro/astro |
| Vite | 8.3.8 | MIT and notices in included license | https://github.com/vitejs/vite |
| TypeScript | 6.0.3 | Apache-2.0 | https://github.com/microsoft/TypeScript |
| Playwright test | 1.65.0 | Apache-2.0 | https://github.com/microsoft/playwright |
| @axe-core/playwright | 4.14.0 | MPL-2.0 | https://github.com/dequelabs/axe-core-npm |
| @astrojs/markdown-remark | 7.3.8 | MIT | https://github.com/withastro/astro |

Astro, Markdown tooling, TypeScript, Playwright and axe are build/test tools; their complete packages are not runtime browser dependencies. Vite-generated helper code can appear in the client bundle. Exact transitive inventory is in reports/dependency-inventory.json and package-lock.json. Original copyright/license notices are preserved in the copied license files and source archives. System fonts are used for prose and native controls; Space Grotesk is self-hosted for display roles under the license below. No externally hosted font requests or third-party imagery are used. Logo/OG SVG and audio fixtures are original synthetic project assets.

## Included static materials

The build copies public/licenses/ to dist/licenses/. Its source-manifest.json records versioned source archive names and SHA-256 hashes for the six runtime packages. Each archive contains the installed unmodified package, plus human-readable TypeScript source extracted from included source-map sourcesContent where available. Package source and copyright headers remain intact. A complete MPL-2.0 license is included alongside package licenses.

The same directory includes LAME-COPYING.txt, LAME-LICENSE.txt and the complete upstream lame-3.100.tar.gz. The source archive was fetched from the official SourceForge project and verified against SHA-256 ddfe36cab873794038ae2c1210557ad34857a4b6bdc515785d1da9e175b1da1e, matching the installed MP3 encoder's provenance README.

The encoder README included in its source archive describes the LAME/Emscripten build, the C bridge and rebuild commands. It identifies unmodified LAME 3.100, Emscripten 4.0.21 and bridge source shipped with that package; reported inlined WASM SHA-256 a680e507e9d91f1a4dcd6f846b9b94ff1fec7e19ff44e803358c218ddbe446a6. This project has not rebuilt that binary. Users may replace/rebuild the encoder using those upstream sources and build instructions; no account or conversion service is needed.

## Owner distribution review

Before public distribution, review the exact source/binary combination and licensing obligations, including availability of Corresponding Source, notices and the ability to use modified library builds. Keep the included source archives accessible beside the app artifact and retain the exact dependency lockfile. Re-run scripts/prepare-licenses.py after dependency changes, refresh inventory/hashes and inspect source forms. Do not claim that a package license label alone completes LGPL/MPL compliance. No owner contact, source-offer address or legal conclusion has been invented.

## Space Grotesk display font

Space Grotesk — Copyright2020 The Space Grotesk Project Authors. SIL Open Font License1.1. Full variable font self-hosted as WOFF2; no font service requests. [License text](/licenses/SpaceGrotesk-OFL.txt). [Original project](https://github.com/floriankarsten/space-grotesk).