Department of Ducks

Licenses

Last updated: September 19, 2026

MaMills and this website are built on open-source software and freely licensed fonts and music. Everything used is credited below; the MIT and Open Font licenses are reproduced in full, and the others are named and linked. The game carries its own copy of this list under Settings → About → Licenses, covering what ships inside the game; the Godot notice there is generated live, so it always matches the build you are running. This page additionally covers the fonts and media used by the website and the trailer.

Game engine

Godot Engine 4.7

Copyright © 2014-present Godot Engine contributors. Copyright © 2007-2014 Juan Linietsky, Ariel Manzur.

MIT License · godotengine.org. Godot bundles further third-party components under their own permissive licenses (MIT, BSD, zlib and others); the complete, build-accurate list is printed on the in-game Licenses screen.

Steam integration

GodotSteam 4.19

Copyright (c) 2015-Current | GP Garcia, Chris Ridenour, and Contributors

MIT License · godotsteam.com

Steamworks SDK

© Valve Corporation.

The Steamworks SDK redistributables (steam_api) are included under the terms of the Steamworks SDK Access Agreement.

Platform marks

Steam Deck logo

©2021 Valve Corporation. Steam, the Steam logo, Steam Deck and the Steam Deck logo are trademarks and/or registered trademarks of Valve Corporation in the U.S. and/or other countries. All rights reserved.

The mark is displayed for one reason: to show that MaMills runs on Steam Deck. It is nominative use - naming a platform - and nothing more. Department of Ducks claims no ownership of, and no right in, the Steam Deck name or logo; all rights in both remain Valve Corporation's. Its appearance here does not mean MaMills is published, sponsored, endorsed, certified or approved by Valve. Nor is it any part of Valve's compatibility programme: those badges are awarded by Valve's own review, MaMills has not been through one, and this mark makes no claim about the outcome.

The artwork is Valve's own, not a redrawing: the monochromatic colourway from the vector file published with the Steam Deck brand guidelines, with only its scale and origin changed, shown in a single flat colour with the clear space the guidelines require. Valve reserves approval of any use of its marks; if Valve would like this one changed or removed, write to mamillsgame@gmail.com and it will be done.

Tux, and the Apple mark

Icons from Simple Icons, released under CC0 1.0.

Tux was drawn by Larry Ewing with the GIMP (lewing@isc.tamu.edu); the vector used here is the Simple Icons rendering of him. Apple, the Apple logo and macOS are trademarks of Apple Inc., registered in the U.S. and other countries; Linux is the registered trademark of Linus Torvalds. A CC0 licence covers the drawings, not the trademarks: both marks appear here only to name a system the game runs on, all rights in them stay with their owners, and neither company endorses or is affiliated with MaMills.

Windows mark

Icon from Font Awesome Free 6, © Fonticons, Inc., under CC BY 4.0.

Microsoft and Windows are trademarks of the Microsoft group of companies. The mark names the system the game runs on, and nothing more: all rights in the name and the logo are Microsoft's, and nothing here implies that MaMills is endorsed by or affiliated with them.

Made with AI tools

AI tools helped design and build this website and make its artwork, including the crest, the duck mascot and the studio intro video. The MaMills trailer and screenshots are captured from the game, and its computer opponent, the Machine, is classic board-game logic, not generative AI.

Music

"Deliberate Thought" - Kevin MacLeod

Kevin MacLeod (incompetech.com)

Licensed under Creative Commons Attribution 4.0 · the looping background track in the game.

"Wholesome" - Kevin MacLeod

Kevin MacLeod (incompetech.com)

Licensed under Creative Commons Attribution 4.0 · the music in the MaMills trailer.

Fonts

All four are licensed under the SIL Open Font License, Version 1.1. The licence asks that its text travel with the font files, so a copy of it sits beside them as assets/fonts/OFL.txt, naming each project and its copyright line; the full text is reproduced further down this page as well. The three web fonts are subsets - Fraunces to the five letters of the wordmark alone - which the licence permits, and none of them is renamed or distributed under a reserved font name.

Fraunces

Copyright 2020 The Fraunces Project Authors (github.com/undercasetype/Fraunces)

Used in the game.

Atkinson Hyperlegible

Copyright 2020 Braille Institute of America, Inc.

Used in the game as its body font, shipped as "MaMills Hyperlegible": modified in 2026 to draw the zero without its slash; every other glyph is unchanged.

Inter

Copyright 2016 The Inter Project Authors (github.com/rsms/inter)

Used in the game and on this website.

Libre Baskerville

Copyright 2012 The Libre Baskerville Project Authors (github.com/impallari/Libre-Baskerville)

Used on this website.

License texts

MIT License - Godot Engine, GodotSteam
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, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
SIL Open Font License, Version 1.1 - all four fonts
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007

PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.

The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The fonts,
including any derivative works, can be bundled, embedded, redistributed
and/or sold with any software provided that any reserved names are not used
by derivative works. The fonts and derivatives, however, cannot be released
under any other type of license. The requirement for fonts to remain under
this license does not apply to any document created using the fonts or
their derivatives.

DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may include
source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).

"Original Version" refers to the collection of Font Software components as
distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to, deleting,
or substituting -- in part or in whole -- any of the components of the
Original Version, by changing formats or by porting the Font Software to a
new environment.

"Author" refers to any designer, engineer, programmer, technical writer or
other person who contributed to the Font Software.

PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining a copy
of the Font Software, to use, study, copy, merge, embed, modify, redistribute,
and sell modified and unmodified copies of the Font Software, subject to the
following conditions:

1) Neither the Font Software nor any of its individual components, in
Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be included
either as stand-alone text files, human-readable headers or in the
appropriate machine-readable metadata fields within text or binary files as
long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the corresponding
Copyright Holder. This restriction only applies to the primary font name as
presented to the users.

4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any Modified
Version, except to acknowledge the contribution(s) of the Copyright
Holder(s) and the Author(s) or with their explicit written permission.

5) The Font Software, modified or unmodified, in part or in whole, must be
distributed entirely under this license, and must not be distributed under
any other license. The requirement for fonts to remain under this license
does not apply to any document created using the Font Software.

TERMINATION
This license becomes null and void if any of the above conditions are not
met.

DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,
TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL, SPECIAL,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO
USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.

Everything else

The MaMills name, artwork, sound effects, and the Department of Ducks crest are © 2026 Department of Ducks and are not covered by the licenses above. See the Terms.

Think something is missing or credited wrongly? Please contact us - we will fix it.