Open-source credits.

These tools build on the work of open-source contributors.

qrcode 1.5.4 — MIT
pdf-lib 1.17.1 — MIT
fflate 0.8.3 — MIT
heic-to 1.6.5 — LGPL-3.0, using libheif 1.23.5 and libde265 1.0.16. The decoder is distributed separately and unmodified. Download corresponding source and build instructions.

Full licence notices. Source packages are included with the HEIC decoder so it can be rebuilt and replaced.