OfficeToPDF PDF additions are provided under AGPL-3.0-or-later.
MuPDF 1.28.1 official source (includes platform/wasm build instructions):
https://mupdf.com/downloads/archive/mupdf-1.28.1-source.tar.gz

The same archive is supplied in consecutive binary chunks. Concatenate in order:
mupdf-1.28.1-source.tar.gz.part1
mupdf-1.28.1-source.tar.gz.part2
mupdf-1.28.1-source.tar.gz.part3
mupdf-1.28.1-source.tar.gz.part4
SHA256 of combined archive: dc94c60b2537e2ac9a2d379dd3801545f84a3a302d15c9da358362a1270707c3
Application source and deployment/build scripts: application-source.zip
No credentials are included. Engine license: /assets/pdf-new/engine/LICENSE.txt