不寐仿宋

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不寐仿宋 / Insomnia FangSong — License and Attributions
========================================================

Copyright (c) 2026 Alexander Tseng.

Insomnia FangSong is a free/libre font derived from HZ Socho
(https://github.com/MihailJP/minchovariant) and from the CJK glyph data of
GlyphWiki (https://glyphwiki.org). It inherits the license terms of its
upstream sources.


SUMMARY
-------
You may use, copy, modify, merge, publish, distribute, and sell copies of
this font, commercially or non-commercially, subject to two conditions:

  (1) NOTICES. All copyright notices and permission notices in this file
      must be preserved in all copies of the font and in supporting
      documentation.

  (2) RESERVED NAME. Derivative fonts must not use "Insomnia" or "不寐"
      in their names. See section 7 below; this condition applies only to
      the present author's own contribution and does not restrict your
      rights to any upstream material.

THE FONT IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.


What was changed in Insomnia FangSong
-------------------------------------
* Added Simplified-Chinese hanzi missing from HZ Socho, and converted the
  existing GB2312 hanzi from Japanese (JIS) glyph forms to mainland-China
  (GB / 新字形) forms. All Chinese hanzi are rendered from GlyphWiki's
  mainland (-g) regional data via the KAGE engine, then traced to outlines.
* Renamed to 不寐仿宋 / Insomnia FangSong; converted to TrueType (glyf) for
  broad application compatibility; fixed vertical metrics; reorganised the
  naming into a Book / Demi / Bold family.
* Non-Chinese glyphs (Latin, Greek, Cyrillic, kana, symbols, punctuation)
  are carried over unchanged from HZ Socho.


========================================================================
1. Overall terms — X11 License (with font-embedding exception)
========================================================================
Insomnia FangSong may be used in any way, including but not limited to
copying, modifying, distributing, or selling copies, as long as you follow
the terms of the X11 License with font embedding exception shown below
(inherited from Computer Modern Unicode and HZ Socho). This permission is
granted regardless of commerciality.

Andrey V. Panov (C) 2005. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, and/or sell copies of the
Software, and to permit persons to whom the Software is furnished to do so,
provided that the above copyright notice(s) and this permission notice appear
in all copies of the Software and that both the above copyright notice(s) and
this permission notice appear in supporting documentation.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE
LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Except as contained in this notice, the name of a copyright holder shall not
be used in advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization of the
copyright holder.

As a special exception, if you create a document which uses these fonts, and
embed these fonts or unaltered portions of these fonts into the document,
these fonts do not by themselves cause the resulting document to be covered
by the X11 License. This exception does not however invalidate any other
reasons why the document might be covered by the X11 License. If you modify
these fonts, you may extend this exception to your version of the fonts, but
you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.


========================================================================
2. GlyphWiki data (Chinese hanzi skeletons)
========================================================================
See https://en.glyphwiki.org/wiki/GlyphWiki:License

The glyphs registered at GlyphWiki, as well as the articles, can be freely
used by anyone. Reuse of this data, such as reproduction or modification of
the glyphs, is permitted. There are no specific restrictions with regards to
displaying the author's name. Reuse of GlyphWiki data as the basis for a new
font, or direct usage of fonts and glyphs copied from GlyphWiki in published
work is allowed. All glyphs at GlyphWiki are free to any use and come with no
warranty. (Copyright 2009 GlyphWiki Project.)

Note: GlyphWiki does not hold copyright on material quoted within its
articles; where such material is reused, its own license applies. The hanzi
used in this font are taken from GlyphWiki's own glyph database.


========================================================================
3. Computer Modern Unicode (Latin / Greek / Cyrillic)
========================================================================
Covered by the X11 License in section 1 above.
Andrey V. Panov (C) 2005.

Version note: Computer Modern Unicode versions 0.6.3a and earlier are
distributed under the X11 License with the font-embedding exception quoted in
section 1. From version 0.7.0 onward the project changed its license to the
SIL Open Font License 1.1. The glyphs inherited by this font come, via HZ
Socho, from the X11-licensed line (0.7.0 and later are not part of this
lineage).

  Upstream site:  https://cm-unicode.sourceforge.io/license.html
  Original site:  http://canopus.iacp.dvo.ru/~panov/cm-unicode/license.html


========================================================================
4. M+ fonts (some symbols)
========================================================================
Copyright (C) Coji Morishita / M+ FONTS PROJECT.

These fonts are free software. Unlimited permission is granted to use, copy,
and distribute them, with or without modification, either commercially or
noncommercially. THESE FONTS ARE PROVIDED "AS IS" WITHOUT WARRANTY.

Note: these terms are those of the original M+ OUTLINE FONTS, which is the
version inherited here. The later M PLUS fonts (2021 onward) are released
under the SIL Open Font License 1.1 and are not part of this lineage.

  Original site:  http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/index.html#license


========================================================================
5. GL-Antique (some symbols)
========================================================================
Copyright (C) 2003-2009 Das Ende der Wildnis (http://heiden.daynight.jp/),
Copyright (C) 2008-2023 Gutenberg Labo (https://github.com/Gutenberg-Labo),
Copyright (C) 2002-2017 M+ FONTS PROJECT (http://mplus-fonts.osdn.jp/),
All rights reserved.

These fonts are free softwares. Unlimited permission is granted to use, copy,
and distribute it, with or without modification, either commercially and
noncommercially. THESE FONTS ARE PROVIDED "AS IS" WITHOUT WARRANTY.

  Upstream repository:  https://github.com/Gutenberg-Labo/GL-Antique
  Original site:        http://gutenberg.osdn.jp/ja/license.html


========================================================================
6. Build tools — KAGE engine (GPL-3.0) and Potrace (GPL-2.0-or-later)
========================================================================
The Chinese hanzi were produced by rendering GlyphWiki's freely-licensed
skeleton data (section 2) into outlines with the KAGE engine
(https://github.com/MihailJP/kage-engine, GNU GPL v3) and then tracing the
result with Potrace (https://potrace.sourceforge.net/, GNU GPL v2 or later).

These are BUILD TOOLS. None of their program code is contained in or
distributed with the font files; the font stores only the resulting glyph
outlines, which are derived from the free GlyphWiki data, not from the tools'
source code.

This position rests on two grounds:

  (a) The GNU GPL version 3, section 0, states that "the output from running
      a covered work is covered by this License only if the output, given its
      content, constitutes a covered work." The Free Software Foundation's
      GPL FAQ likewise explains that the output of a program is generally not
      covered by the license of that program, unless the program copies part
      of itself into the output. The glyph outlines in this font are derived
      from GlyphWiki's freely-licensed skeleton data, not from the source
      code of KAGE or Potrace.

  (b) The same position is taken upstream. HZ Socho is generated in exactly
      the same way — KAGE engine and Potrace applied to GlyphWiki data — yet
      is released under the X11 terms in section 1 by the author of that very
      KAGE-engine fork.

On this basis this font is distributed under the permissive terms above
(sections 1-5) rather than the GPL.

Note: this is a good-faith reading of the upstream terms, not legal advice.
If you redistribute the *build scripts* together with a copy of the KAGE
engine or Potrace, keep those tools under their own GPL licenses.


========================================================================
7. Reserved name
========================================================================
Derivative fonts must not use "Insomnia" or "不寐" in their names.

This condition is imposed by the present author on his own contribution to
this font, and serves the same purpose as the "Reserved Font Name" mechanism
of the SIL Open Font License: to prevent modified versions from being
mistaken for official releases of this project.

It does not restrict, and is not intended to restrict, anyone's rights to the
upstream material described in sections 1-5 under those sections' own terms.


========================================================================
Attributions
========================================================================
* HZ Socho — MihailJP <mihailjp@gmail.com>
* GlyphWiki contributors (including MihailJP)
* Computer Modern Unicode — Andrey V. Panov
* M+ fonts — Coji Morishita / M+ FONTS PROJECT
* GL-Antique — Das Ende der Wildnis; Gutenberg Labo; M+ FONTS PROJECT
* Simplified-Chinese adaptation & Insomnia FangSong build — Alexander Tseng

Insomnia FangSong is an independent derivative and is not affiliated with or
endorsed by the authors of HZ Socho, GlyphWiki, Computer Modern Unicode,
M+ fonts, or GL-Antique.

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