Music
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"Gymnopedie No. 1" — composed by Erik Satie; arranged/performed by Kevin MacLeod (incompetech.com).
https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100787
"Funky Chunk" — Kevin MacLeod (incompetech.com).
https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1500054
Both recordings licensed under Creative Commons Attribution 4.0:
https://creativecommons.org/licenses/by/4.0/
Web copies re-encoded to 128 kbps. Playback is excerpted, looped, filtered, and faded for the scene.

Character and scene
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Body topology and base weights: MakeHuman Community bundled assets, CC0 1.0.
https://github.com/makehumancommunity/makehuman
License text included in MAKEHUMAN-ASSET-LICENSE.txt.
Clothing, cap, head silhouette, props, lighting, and choreography authored for this project.
The janitor uses the supplied second portrait, with the user's stated consent from that friend.
The previously removed character's portrait and skin projection are not included.

Dialogue: generic synthetic voice rendered locally with eSpeak NG; no voice cloning.
https://github.com/espeak-ng/espeak-ng
Three.js: MIT license, included in vendor/THREE-LICENSE.txt.