# Licensing

## Original project code

Copyright (c) 2026 Spider-Man recompilation project contributors.

The original code of this project — the build scripts, the game profile, the ROM-set
definitions, the board adaptations (4-player PPI, input mapping), the ports and the
documentation — is licensed under the **PolyForm Noncommercial License 1.0.0**:

<https://polyformproject.org/licenses/noncommercial/1.0.0>

A copy of the terms follows at the end of this file. In short: you may use, change and
share the code for any noncommercial purpose, including personal study, research,
experiment and hobby projects. Commercial use is not permitted. The software comes
without warranty.

## Third-party code and notices

This project is built on, and contains, code that is **not** PolyForm-licensed. Those
parts keep their own licenses and copyright notices; they are not relicensed here.

### arcade-decomp (`tools/core/`)

The decompiler, V60/Z80 frontends, analysis tools and asset formats are
**BSD 3-Clause**, Copyright (c) **Sebastian Toyos** — creator of
[arcade-decomp](https://github.com/cheviman/arcade-decomp), GitHub
[@cheviman](https://github.com/cheviman). See `tools/core/LICENSE` and the
headers of the individual files. This project uses arcade-decomp as a Git submodule
and has local changes for the Spider-Man program (frame-wait flag, ROM mirrors,
halfword search, Z80 IM 2 and `(C)` port I/O). Those changes are offered under the
same BSD 3-Clause terms as the upstream files.

### System 32 runtime and SDL2 port (`runtime/`, `ports/sdl2/`)

The board model, video library, YM3438 and RF5C68 implementations, and the SDL2 port
are derived from **segasonic-decomp**, **BSD 3-Clause**, Copyright (c) Sebastian Toyos.
The original BSD headers are kept in every file. See `runtime/replaced.txt` and the
file headers.

### MAME and ymfm (`tools/reference/`)

`tools/reference/mame/` and `tools/reference/ymfm/` are MAME's and ymfm's code,
**BSD 3-Clause**, under their copyright holders' terms. They are built into the
reference tools (`s32ref`, `oracle`, `oracle_z80`, `chipcheck`) and, as a documented
fallback, into the windowed game's sound board (`runtime/src/sound_reference.cpp`
around `tools/reference/sound/s32sound.cpp`): the Z80 sound CPU is emulated until its
native translation is complete. The main V60 program is native. See
`tools/reference/mame/LICENSE` and `tools/reference/ymfm/LICENSE`.

### SDL2

SDL2 is used under the **zlib license**. It is linked dynamically on Windows and
packaged beside the executable (`SDL2.dll`); on Linux it is the system's SDL2.
See <https://www.libsdl.org/license.php>.

### Game data

No ROM, BIOS, graphics, audio, program bytes or other proprietary game data is
licensed by this project. The player supplies their own legally obtained MAME
`spidman.zip`. Spider-Man and all related characters are trademarks of Marvel
Characters, Inc.; the arcade game is Copyright (c) 1991 Sega. This is an unofficial
preservation and research project, not affiliated with or endorsed by Sega or Marvel.

---

# PolyForm Noncommercial License 1.0.0

<https://polyformproject.org/licenses/noncommercial/1.0.0>

## Acceptance

In order to get any license under these terms, you must agree to them as both strict obligations and conditions to all your licenses.

## Copyright License

The licensor grants you a copyright license for the software to do everything you might do with the software that would otherwise infringe the licensor's copyright in it for any permitted purpose. However, you may only distribute the software according to [Distribution License](#distribution-license) and make changes or new works based on the software according to [Changes and New Works License](#changes-and-new-works-license).

## Distribution License

The licensor grants you an additional copyright license to distribute copies of the software. Your license to distribute covers distributing the software with changes and new works permitted by [Changes and New Works License](#changes-and-new-works-license).

## Notices

You must ensure that anyone who gets a copy of any part of the software from you also gets a copy of these terms or the URL for them above, as well as copies of any plain-text lines beginning with `Required Notice:` that the licensor provided with the software. For example:

> Required Notice: Copyright Yoyodyne, Inc. (http://example.com)

## Changes and New Works License

The licensor grants you an additional copyright license to make changes and new works based on the software for any permitted purpose.

## Patent License

The licensor grants you a patent license for the software that covers patent claims the licensor can license, or becomes able to license, that you would infringe by using the software.

## Noncommercial Purposes

Any noncommercial purpose is a permitted purpose.

## Personal Uses

Personal use for research, experiment, and testing for the benefit of public knowledge, personal study, private entertainment, hobby projects, amateur pursuits, or religious observance, without any anticipated commercial application, is use for a permitted purpose.

## Noncommercial Organizations

Use by any charitable organization, educational institution, public research organization, public safety or health organization, environmental protection organization, or government institution is use for a permitted purpose regardless of the source of funding or obligations resulting from the funding.

## Fair Use

You may have "fair use" rights for the software under the law. These terms do not limit them.

## No Other Rights

These terms do not allow you to sublicense or transfer any of your licenses to anyone else, or prevent the licensor from granting licenses to anyone else. These terms do not imply any other licenses.

## Patent Defense

If you make any written claim that the software infringes or contributes to infringement of any patent, your patent license for the software granted under these terms ends immediately. If your company makes such a claim, your patent license ends immediately for work on behalf of your company.

## Violations

The first time you are notified in writing that you have violated any of these terms, or done anything with the software not covered by your licenses, your licenses can nonetheless continue if you come into full compliance with these terms, and take practical steps to correct past violations, within 32 days of receiving notice. Otherwise, all your licenses end immediately.

## No Liability

***As far as the law allows, the software comes as is, without any warranty or condition, and the licensor will not be liable to you for any damages arising out of these terms or the use or nature of the software, under any kind of legal claim.***

## Definitions

The **licensor** is the individual or entity offering these terms, and the **software** is the software the licensor makes available under these terms.

**You** refers to the individual or entity agreeing to these terms.

**Your company** is any legal entity, sole proprietorship, or other kind of organization that you work for, plus all organizations that have control over, are under the control of, or are under common control with that organization. **Control** means ownership of substantially all the assets of an entity, or the power to direct its management and policies by vote, contract, or otherwise. Control can be direct or indirect.

**Your licenses** are all the licenses granted to you for the software under these terms.

**Use** means anything you do with the software requiring one of your licenses.
