MP3 export uses unmodified @breezystack/lamejs 1.2.7 by Alex Zhukov and contributors, licensed LGPL-3.0.
License texts: /third-party/lamejs/LGPL-3.0.txt and /third-party/lamejs/GPL-3.0.txt
Upstream commercial-use note: /third-party/lamejs/LICENSE.txt
LAME project: https://lame.sourceforge.net
Unmodified library module: /third-party/lamejs/lamejs.js
Corresponding source: https://github.com/shijinyu/lamejs
OpenSpeech imports Mp3Encoder through lib/audio-export.ts. The library may be replaced with an API-compatible version and rebuilt; no restriction on debugging such modifications is imposed.