Final Fantasy VI Ultimate patcher software
Copyright (C) 2026 UndaC

The original patcher software is licensed under GNU General Public License
version 3 (GPL-3.0-only). You may redistribute and modify the covered software
under that license. It is supplied without warranty, including implied
warranties of merchantability or fitness for a particular purpose. See the
complete license in COPYING.txt. Editable source and build instructions are
provided alongside the page in PATCHER-SOURCE.zip.

This grant covers the patcher software and original contributions to its patch
instructions. It does not grant rights in Final Fantasy game code, graphics,
music, text, trademarks, user-supplied ROMs, or the resulting game. No ownership
of third-party game material is claimed. No ROM files are included.

Upstream tooling and modifications

The LZSS implementation in patcher_core.js is a JavaScript adaptation of
ff6/tools/ff6_lzss.py from everything8215's ff6 project, licensed under GPLv3.
Text encoding behavior and definitions also draw on that project's romtools
and the FF6Tools project. The local upstream revisions used are:

  ff6, everything8215
  https://github.com/everything8215/ff6
  2b6394b7b40f1acde5de1ce3cb422fcdb6b77379

  romtools, everything8215
  https://github.com/everything8215/romtools
  f023d6b2ebdafd5a23a79264a9a3775ff5ea537e

  FF6Tools, everything8215
  https://github.com/everything8215/ff6tools
  5390cef7f13483681fa8b43f39a38c05a497946a

Each local upstream checkout includes GNU GPL version 3. COPYRIGHT notices in
upstream files, where present, remain attributable to their respective authors.
The license text is reproduced unchanged from ff6/LICENSE.

Modifications by UndaC, 2026-09-20: browser and Node ports, recipe execution,
ROM-backed text edits and script conversions, input and output validation,
offline page interface, and standalone source packaging. These files are
modified implementations, not unmodified upstream releases.

Game-fix research and community credits are listed separately in CREDITS.txt.
Those credits do not themselves license any copied third-party implementation.

Retained GPL game repair

The tremolo repair (change 30) is everything8215's TREMOLO_BUGFIX implementation
in the ff6 revision above, src/spc/spc_main.asm, InitTremolo. Its three enabled
instructions are included in PATCHER-SOURCE.zip as tremolo-fix.asm, under the
upstream GPLv3 license. TREMOLO-SOURCE.txt explains placement and modification.
The page builder assembles the fragments into the patch recipe. UndaC extracted
and labelled the fragments on 2026-09-26 without changing their instructions.
The original sound driver is supplied by the user's ROM and is not included
or licensed by this source supplement.

Companion guide and game material

The site folder includes screenshots, rendered sprite comparisons, short
gameplay videos and quotations from Final Fantasy III (USA, SNES, version 1.0),
Final Fantasy VI (Japan, Super Famicom), Final Fantasy VI Advance (USA, GBA),
and the modified game. They accompany descriptions of the changes. Original
game material is copyright Square Enix and its respective rights holders;
Final Fantasy is a trademark of Square Enix. The project is not affiliated
with, sponsored by or endorsed by Square Enix.

The software license does not license those game images, footage, quotations,
or underlying material in edited examples. No Square Enix permission is
claimed. Their inclusion in the guide is separate from the patcher's local
processing of user-supplied ROMs. No ROM files are distributed.