PDF.js 6.3.289 — Liberation Sans 1.07.4 source materials

This archive accompanies TaoLiZhiYi's PDF.js standard-font resources. It is
redistributable font source material, separate from the application's license.
Font license: GNU GPL version 2 with the Liberation font exception. The full
upstream terms and GPL text are in LICENSE_LIBERATION and in the unmodified
source archive's License.txt/COPYING. No fonts were modified by TaoLiZhiYi.

CONTENTS
1. liberation-fonts-1.07.4.tar.gz: unmodified upstream source, including FontForge
   SFD sources, all upstream notices, Makefile and build scripts.
   https://releases.pagure.org/liberation-fonts/liberation-fonts-1.07.4.tar.gz
2. mozilla-fonts/: the exact four TTF files distributed by PDF.js. Each matches
   Mozilla's original introducing commit 34a2fa72c70ee8722a740d4d328d68df3c6ecc75.
   Exact URLs and hashes are in mozilla-font-provenance.json.
3. editable/: a complete editable FontTools TTX representation of those exact
   TTFs (all font tables, outlines, character maps, layout and hint information).
4. rebuild_fonts.py: rebuild these representations using fonttools==4.61.1.
   Run: python rebuild_fonts.py <new-output-directory>
   No network is used by this script. Install the indicated MIT-licensed
   FontTools dependency separately if needed. Four rebuilt fonts were verified
   to preserve every glyph outline, glyph order, advance/side-bearing metric,
   character map, glyph hint and global hint program of the shipped TTFs.
   Rebuilding reserializes tables; output bytes/padding need not be identical.

PROVENANCE LIMIT
Mozilla's README describes these files as an unmodified upstream 1.07.4 release,
but comparison against the official ttf-1.07.4.tar.gz shows distinct packing and
682/687 versus 681 glyphs. We do not claim the official binary release or a
fresh SFD build is byte-identical to PDF.js's fonts. The original SFD source is
included in full, and the editable TTX sources are specifically derived from
the exact Mozilla font bytes to retain its 681-glyph order. The comparison is
recorded in source-byte-diagnostic.json. No unsupported claim about the
historical transformation is made.

Upstream source project: https://github.com/liberationfonts/liberation-1.7-fonts
Mozilla introduction: https://github.com/mozilla/pdf.js/commit/34a2fa72c70ee8722a740d4d328d68df3c6ecc75
Mozilla source directory: https://github.com/mozilla/pdf.js/tree/v6.3.289/external/standard_fonts

中文说明：本包随附完整官方 SFD 源码、PDF.js 精确字体、完整可编辑 TTX
和重建脚本。四字体轮廓、映射、字距与提示指令的重建核对通过；不声称
重建的二进制布局与原文件逐字节相同。字体适用其独立 GPL2 + 字体例外，
不适用桃李智翼软件本身的专有许可。
