Vidlet is proprietary software, © Spark Games Ltd. The components below ship with it under their own licences, which continue to apply.
Video and audio processing runs on FFmpeg compiled to WebAssembly, licensed under the GNU Lesser General Public License, version 2.1 or later. It is loaded as a separate WebAssembly file, which you are free to replace with your own build. ffmpeg.org
H.264 encoding is performed by your browser, not by Vidlet.
Voice denoising uses RNNoise, © Xiph.Org Foundation, licensed under the BSD 3-Clause License. gitlab.xiph.org/xiph/rnnoise
Vidlet also bundles open-source libraries under the MIT, ISC and Apache 2.0 licences, whose notices are preserved in the distributed build.