# Third-party material in pax-helios

Everything in the game that somebody else made, what it is licensed
under, and what that obliges us to do. The game is sold, so this is a
gate rather than a courtesy: the permissive licences below (MIT, BSD,
zlib) all require their copyright notice to travel with the binary, and
the SIL Open Font License requires its full text to accompany the font.

This file ships inside the installer and the Windows zip as
`THIRD-PARTY-NOTICES.txt`, which is how that obligation is met. If you
add a dependency, an asset, a font or a sound, add it here in the same
commit — a notice that is assembled later is a notice that is wrong.

Verified against the files on disk on 2026-09-20, not from memory:
licence texts from each component's own LICENSE file, font terms
from the TTF name table, model provenance from each glTF generator
field, Go module licences from the module cache. The two exceptions
are marked where they appear — the SDXL model licence (stated from
general knowledge, not read from the local weights) and the audio
pack (not established at all).


## Libraries

All linked into `pax-helios` and/or `pax-helios-launcher`. SDL3 and Jolt
are shipped as separate shared libraries beside the executable
(`libSDL3.so*`, `libjoltc.so*`, `SDL3.dll`, `joltc.dll`); the rest are
compiled in.

| Component | Version | Licence | Copyright |
|---|---|---|---|
| [SDL3](https://libsdl.org) | 3.4.10 (Linux), 3.4.12 (Windows) | zlib | 1997–2026 Sam Lantinga |
| [Jolt Physics](https://github.com/jrouwe/JoltPhysics) | 5.6.0 | MIT | 2021 Jorrit Rouwe |
| [JoltC](https://github.com/JoltPhysicsC) (Odin bindings) | vendored | MIT | 2025 Johannes du Randt |
| [Clay](https://github.com/nicbarker/clay) (UI layout) | vendored | zlib/libpng | 2024 Nic Barker |
| [miniaudio](https://miniaud.io) | 0.11.24 | Public domain (Unlicense) **or** MIT-0 | David Reid |
| [stb_image](https://github.com/nothings/stb) | 2.27 | MIT **or** public domain | 2017 Sean Barrett |
| [stb_truetype](https://github.com/nothings/stb) | 1.26 | MIT **or** public domain | 2017 Sean Barrett |
| [Odin](https://odin-lang.org) (compiler, core, vendor) | dev-2026-06-nightly (7ab61e4) | zlib | 2016–2025 Ginger Bill |

miniaudio, stb_image and stb_truetype reach the build through Odin's
`vendor:` collection rather than being vendored here directly. They are
still distributed inside our binaries, so they are still listed.


## Fonts

Both are embedded in the binaries rather than loaded from `assets/`, and
both still require notice.

| Font | Version | Licence | Copyright |
|---|---|---|---|
| [Inter](https://github.com/rsms/inter) | 4.001 | SIL Open Font License 1.1 | 2016 The Inter Project Authors |
| [DejaVu Sans Mono](https://dejavu-fonts.github.io) | 2.37 | Bitstream Vera Fonts Copyright; DejaVu changes are public domain | 2003 Bitstream, Inc. |

Two conditions on Inter worth knowing, because they constrain what we
may do rather than just what we must say:

- The OFL text must accompany the font. It is reproduced in full below.
- The font may not be sold on its own. Selling a game that embeds it is
  fine; selling the font is not. We do not.
- "Inter" is a trademark of rsms. We ship it unmodified, so no reserved
  font name question arises — but a modified copy could not keep the
  name.


## Audio

| File | Source | Licence |
|---|---|---|
| `assets/audio/ui/client_startup.wav` | Menu/Misc. Sound Pack — Kevin Fowler (itch.io, March 2015) | **UNCONFIRMED** |
| `assets/audio/ui/hover.wav` | as above | **UNCONFIRMED** |
| `assets/audio/ui/click.wav` | as above | **UNCONFIRMED** |
| `assets/audio/ui/back.wav` | as above | **UNCONFIRMED** |

**This is the one open item in this file.** All four carry the same
embedded metadata — album "Menu/Misc. Sound Pack", artist Kevin Fowler,
comment "Originally posted to itch.io. Remember to directly support
creators you like!" — and no licence field. A search did not turn up
that pack, so the terms have not been read.

`client_startup.wav` shipped publicly in v0.178.1 and the other three
ship from v0.180.0, so all four are now out in the world. That is not
an emergency; itch.io audio packs of this kind are usually free for
commercial use, and the comment reads like a donation request rather
than a licence condition. But "usually" is not a licence. What is
needed is the pack's own terms from wherever it was downloaded, and
then one of:

- CC0 or equivalent — record it here and nothing else changes.
- Free with attribution — record it here **and** credit Kevin Fowler in
  the game's credits, which do not exist yet.
- Anything restricting commercial use or redistribution — replace the
  files. Freesound CC0 is the usual substitute.

The rule this file exists to enforce is in `assets/audio/README.md`:
these ship inside a product that is sold, so the licence has to permit
that.


## Generated images

| File | Made with | Licence position |
|---|---|---|
| `assets/ui/panel_plate.png` | Stable Diffusion XL 1.0 via ComfyUI, run locally | see below |
| `assets/ui/backdrop.png` | Stable Diffusion XL 1.0 via ComfyUI, run locally | see below |

Both were generated on our own hardware from our own prompts. SDXL 1.0
is released by Stability AI under the **CreativeML Open RAIL++-M**
licence, which permits commercial use of outputs and imposes use-based
restrictions on the model rather than claiming ownership of what it
produces.

*Unlike every other entry in this file, that is stated from general
knowledge rather than read from the licence file shipped with the
weights on shake.* It is the well-known licence for SDXL 1.0 and the
conclusion is not in doubt, but if this document is ever relied on for
anything consequential, confirm it against the model card. The model weights are not redistributed by us — only
the images — and the images were further processed (blended toward the
panel colour, cropped) before shipping.

ComfyUI itself (GPL-3.0) is a local tool and is not distributed with the
game, so its licence does not reach our binaries.

The canny T2I-adapter used for the instrument strip is **not** listed
here: that asset was deleted in v0.175.0 and nothing generated with it
ships.


## Ours, for the avoidance of doubt

No third-party claim attaches to these — they were made here:

- Every `.glb` in `assets/models/` (Blender exports, or generated by our
  own `pax-modeler` / `make_console_glb` / `gen-anim-fixture` tools —
  checked via each file's glTF `generator` field).
- Every shader in `assets/shaders/`.
- The procedural sound effects synthesized in `src/audio.odin`.
- All procedural UI geometry: bezels, chamfers, glows, tick strips.
- The universe generator, the manifest format, the protocol.


## The other two repos

The server and the portal are services, not distributed binaries, so
their dependencies' notice requirements are not triggered by hosting
them. They are documented anyway:

- `pax-heliopause/docs/THIRD-PARTY.md` — 9 Go modules.
- `pax-portal/docs/THIRD-PARTY.md` — 37 Go modules, mostly Tailscale's tree.


## Full licence texts

Reproduced verbatim from the files shipped with each component.


### SDL3 — zlib license

```
Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
  
This software is provided 'as-is', without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
  
1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required. 
2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
```

### Jolt Physics — MIT License

```
Copyright 2021 Jorrit Rouwe

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.
```

### JoltC (Odin bindings) — MIT License

```
MIT License

Copyright (c) 2025 Johannes du Randt

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.

---

MIT License

Copyright (c) Amer Koleci and Contributors

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.
```

### Clay — zlib/libpng license

```
zlib/libpng license

Copyright (c) 2024 Nic Barker

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the
use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

    1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software in a
    product, an acknowledgment in the product documentation would be
    appreciated but is not required.

    2. Altered source versions must be plainly marked as such, and must not
    be misrepresented as being the original software.

    3. This notice may not be removed or altered from any source
    distribution.
```

### miniaudio — public domain (Unlicense) or MIT-0

```
/*
This software is available as a choice of the following licenses. Choose
whichever you prefer.

===============================================================================
ALTERNATIVE 1 - Public Domain (www.unlicense.org)
===============================================================================
This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.

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 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.

For more information, please refer to <http://unlicense.org/>

===============================================================================
ALTERNATIVE 2 - MIT No Attribution
===============================================================================
Copyright 2025 David Reid

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.

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.
*/
```

### stb_image / stb_truetype — MIT License or public domain

```
ALTERNATIVE A - MIT License
Copyright (c) 2017 Sean Barrett
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.
------------------------------------------------------------------------------
ALTERNATIVE B - Public Domain (www.unlicense.org)
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.
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 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.
------------------------------------------------------------------------------
*/
```

### Odin (compiler, core and vendor libraries) — zlib license

```
Copyright (c) 2016-2025 Ginger Bill. All rights reserved.

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
```

### Inter — SIL Open Font License 1.1

```
Copyright (c) 2016 The Inter Project Authors (https://github.com/rsms/inter)

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL

-----------------------------------------------------------
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 AND 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.
```

### DejaVu Sans Mono — Bitstream Vera Fonts Copyright; DejaVu changes public domain

```
Fonts are (c) Bitstream (see below). DejaVu changes are in public domain.

Bitstream Vera Fonts Copyright
------------------------------

Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Bitstream Vera is a trademark of Bitstream, Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of the fonts accompanying this license ("Fonts") and associated documentation files (the "Font Software"), to reproduce and distribute the Font Software, including without limitation the rights to use, copy, merge, publish, distribute, and/or sell copies of the Font Software, and to permit persons to whom the Font Software is furnished to do so, subject to the following conditions:

The above copyright and trademark notices and this permission notice shall be included in all copies of one or more of the Font Software typefaces.

The Font Software may be modified, altered, or added to, and in particular the designs of glyphs or characters in the Fonts may be modified and additional glyphs or  or characters may be added to the Fonts, only if the fonts are renamed to names not containing either the words "Bitstream" or the word "Vera".

This License becomes null and void to the extent applicable to Fonts or Font Software that has been modified and is distributed under the "Bitstream Vera" names.

The Font Software may be sold as part of a larger software package but no copy of one or more of the Font Software typefaces may be sold by itself.

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 BITSTREAM OR THE GNOME FOUNDATION 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.

Except as contained in this notice, the names of Gnome, the Gnome Foundation, and Bitstream Inc., shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Font Software without prior written authorization from the Gnome Foundation or Bitstream Inc., respectively. For further information, contact: fonts at gnome dot org. 
```
