Liberation Sans 1.07.4 — corresponding source for DobryKalkulator.pl PDF comparison
Prepared: 2026-09-18

The four unmodified TTF files distributed with our PDF.js 6.3.289 installation
are byte-for-byte identical to the files in Debian fonts-liberation
1:1.07.4-11. This package includes the original source AND the Debian patches
and build instructions. The original upstream binary release alone differs
from these font files; use the Debian source package provided here.

Copyright (c) 2007 Red Hat, Inc. and the respective contributors.
License: GNU GPL version 2 with the Liberation font exception.
The full GPL and exception are included as COPYING and License.txt.
Debian copyright and packaging information are in the Debian source archive.
No modifications to the deployed font files were made by DobryKalkulator.pl.

Contents:
  fonts-liberation_1.07.4.orig.tar.gz — upstream SFD source and build scripts
  fonts-liberation_1.07.4-11.debian.tar.xz — Debian patches, rules and metadata
  fonts-liberation_1.07.4-11.dsc — Debian source description and source checksums
  verification-debian.json — SHA-256 comparison with the four deployed fonts
  debian-downloads.json — download provenance and SHA-256 checksums
  COPYING, License.txt, debian-copyright.txt — license and attribution texts

Source origin:
https://deb.debian.org/debian/pool/main/f/fonts-liberation/
https://sources.debian.org/src/fonts-liberation/1:1.07.4-11/
https://github.com/liberationfonts/liberation-1.7-fonts

Rebuild using a Debian environment with dpkg-dev, debhelper-compat (= 11),
FontForge (fontforge-nox or fontforge), and fonttools. A source-enabled Debian
environment can install dependencies with:
  apt-get build-dep fonts-liberation
After unpacking this ZIP, run:
  dpkg-source -x fonts-liberation_1.07.4-11.dsc
  cd fonts-liberation-1.07.4
  dpkg-buildpackage -us -uc -b
dpkg-source applies the patches listed in debian/patches/series. The included
debian/control lists build dependencies and debian/rules invokes debhelper.
The standard system/toolchain packages are not bundled. A build with a different
FontForge/toolchain may produce different binary metadata; byte-identical local
recompilation has not been claimed. Correspondence was verified against all four
fonts in the official Debian binary package and against the DSC source hashes.

You may obtain, study, modify and redistribute these sources under their license.
The font exception allows embedding an unmodified font in a document without
the font alone making that document subject to the GPL. The exception does not
remove the license obligations when distributing the font itself.

Public corresponding-source package:
https://dobrykalkulator.pl/dk-js/dkn-n08-liberation-sources.zip
Public license:
https://dobrykalkulator.pl/dk-js/dkn-n08-pdf-fonts/LICENSE_LIBERATION