Open-Source Licenses
wilds.ai is built on open-source software. This page credits the third-party projects we redistribute or run in your browser and reproduces their licenses, as those licenses require. We're grateful to the people who made them.
Emulator cores
The retro and fantasy-console games on wilds.ai run on these open-source emulator cores, executed locally in your browser — no game code runs on our servers:
| Core | Powers | License | Copyright | Source |
|---|---|---|---|---|
| jsnes | NES (Nintendo Entertainment System) | Apache-2.0 | © Ben Firshman and contributors | github.com/bfirsh/jsnes |
| TIC-80 (libtic80) | TIC-80 fantasy console | MIT | © 2017 Vadim Grigoruk (nesbox) and contributors | github.com/nesbox/TIC-80 |
| boytacean | Game Boy / Game Boy Color | Apache-2.0 | © João Magalhães and contributors | github.com/joamag/boytacean |
MS-DOS console (v86 + FreeDOS)
The MS-DOS console boots a full PC in your browser: the v86 x86 emulator runs a FreeDOS guest operating system, and each game is loaded as a virtual floppy disk. This is an aggregation — v86 itself is permissively licensed and runs as part of wilds.ai, while the BIOS firmware and the FreeDOS guest OS run inside the emulated machine and are redistributed verbatim and unmodified. None of the GPL or LGPL components below are linked into, or patched by, the wilds.ai application.
| Component | Role | Version | License | Corresponding source |
|---|---|---|---|---|
v86 (libv86.js, v86.wasm, v86-fallback.wasm) | x86 PC emulator (runs in your browser) | 0.5.373 | BSD-2-Clause | github.com/copy/v86 · npm [email protected] |
SeaBIOS (bios/seabios.bin) | Guest machine BIOS firmware | rel-1.16.2 | LGPL-3.0 | github.com/coreboot/seabios @ rel-1.16.2 |
VGABIOS (bios/vgabios.bin) | Guest machine VGA BIOS firmware | Bochs/LGPL VGABIOS | LGPL-2.1 | savannah.nongnu.org/projects/vgabios · as vendored by v86 @ 679ecd2e |
FreeDOS kernel (kernel.sys, baked into the boot floppy) | Guest operating-system kernel | ke2045 | GPL-2.0 | github.com/FDOS/kernel @ ke2045 |
FreeCOM (command.com, baked into the boot floppy) | Guest command interpreter (COMMAND.COM) | com086 (FreeCOM 0.86) | GPL-2.0 | github.com/FDOS/freecom @ com086 |
| FreeDOS FAT12 boot sector (sector 0 of the boot floppy) | Loads the kernel by name | FreeDOS | GPL-2.0 | github.com/FDOS/kernel — SOURCE/KERNEL/boot/ |
SeaBIOS and VGABIOS are v86 0.5.373's prebuilt, unmodified firmware blobs,
vendored from copy/v86 @ 679ecd2e;
their corresponding upstream source is SeaBIOS rel-1.16.2 and the Bochs LGPL
VGABIOS respectively. Copyright is retained per upstream: v86 © the v86
contributors; SeaBIOS © the SeaBIOS / coreboot contributors; VGABIOS © the
Bochs LGPL VGABIOS contributors; FreeDOS kernel © the FreeDOS kernel
contributors; FreeCOM © the FreeCOM contributors.
Modifications: none. Every binary above is the unmodified upstream release at the version shown. wilds.ai assembles the FreeDOS boot floppy from these verbatim binaries; it does not patch their source.
Two interchangeable v86 wasm builds. v86 0.5.373 ships both v86.wasm (the
JIT build, used when the play page is cross-origin-isolated and SharedArrayBuffer
is available) and v86-fallback.wasm (the pure-interpreter build, used otherwise).
Both are the unmodified upstream blobs from the same npm tarball, pair with the
same libv86.js, and are BSD-2-Clause.
Build manifest — the redistributed FreeDOS boot floppy. The boot floppy
(freedos-base.img) is a 720 KiB FAT12 image deterministically assembled from
the verbatim GPL binaries above plus a two-line CONFIG.SYS
(SHELL=A:\COMMAND.COM /P /E:512) and AUTOEXEC.BAT
(if exist B:\GO.BAT call B:\GO.BAT). It contains only FreeDOS — no bundled
games. The exact inputs and their SHA-256 checksums:
v86 libv86.js 20a683e03bd990a9a9b7565e635310bb4fef7625c809c713fdbca73119d1efc0
v86-fallback.wasm b789dddf064f4d114560a08faca5559493cf8d7e58828a9e3650576aac467d1d
v86.wasm 3aea6f02754eeb343bc2a6ef4e2ef76e3fd9e7214eae43d93e416f059b97d678
v86 source tarball 1e042b5cc8bff4358462687d7f406cdcfa091142c080c61ef7da0b6cacd3cbc3
bios/seabios.bin 73e3f359102e3a9982c35fce98eb7cd08f18303ac7f1ba6ebfbe6cdc1c244d98
bios/vgabios.bin a4bc0d80cc3ca028c73dafa8fee396b8d054ce87ebd8abfbd31b06b437607880
kernel.sys (ke2045) b8d6795212d4beef0d25e8bd301fa43c8a58f07ab671c4fd1642cbfddf8210f7
command.com (com086) d33d3e0a3a0c02ef74d9b9e6d72a3adc7969630bacb7ec8e4e6a7cb197dcefb2
bootsector.bin ef68bcdb99760f83b636cbf0f07f395ae7dff5b96767fee86a939339975c2d6c
freedos-base.img c545b348f482a14173cf7c0616a7d3a1ade42c6c442a93d60af2e5ffe5398fef (assembled output)
Written offer for the corresponding source. The GPL-2.0 and LGPL components above are redistributed verbatim, and their complete corresponding source is the upstream release at each linked tag. In addition, for at least three years from the date wilds.ai distributes these binaries, we will provide to any third party — on request to [email protected] — a complete machine-readable copy, on a medium customarily used for software interchange, of the corresponding source for the SeaBIOS rel-1.16.2, VGABIOS, FreeDOS kernel ke2045, FreeCOM com086, and FreeDOS boot-sector binaries as shipped (the SHA-256 checksums in the build manifest above), for no more than our cost of physically performing the distribution.
Full license texts: BSD-2-Clause · LGPL-2.1 · LGPL-3.0 · GPL-2.0. The wilds.ai cart-builder and FAT12 serializer that turn an uploaded game into a virtual floppy are first-party code, not covered by these licenses.
Bundled game dependency — DOS/32A. Some curated MS-DOS games bundle the
DOS/32A DOS extender (shipped as DOS4GW.EXE) so a protected-mode game runs
under FreeDOS. © Narech K. 1996–2006, redistributed verbatim under its BSD-style
license — commercial redistribution permitted; attribution + the disclaimer
required (full text alongside the game at
/retro-engines/dos/games/DOS32A-LICENSE).
This product uses DOS/32 Advanced DOS Extender technology. The curated
Anarch cart bundles it; the game itself is CC0 (© drummyfish).
Interactive fiction (Inform 7)
Inform 7 stories on wilds.ai are compiled on our servers by the Inform compiler, and a small set of license-vetted community extensions is bundled with it:
| Component | Role | License | Author | Source |
|---|---|---|---|---|
| Inform 7 (compiler + Inform 6 + Standard Rules + Basic Inform + Kits) | Compiles Inform 7 source to Glulx / Z-machine story files | Artistic-2.0 | © Graham Nelson and the Inform team | github.com/ganelson/inform |
| Approaches | Bundled Inform 7 extension (a "go to <place>" travel action) | CC-BY-4.0 | © Emily Short | Friends of Inform 7 public library |
| Numbered Disambiguation Choices | Bundled Inform 7 extension (numbered "which do you mean?" menus) | CC-BY-4.0 | © Aaron Reed | Friends of Inform 7 public library |
| Bulk Limiter | Bundled Inform 7 extension (carry/container capacity) | CC-BY-4.0 | © Eric Eve | Friends of Inform 7 public library |
| Underside | Bundled Inform 7 extension (look under / hide beneath scenery) | CC-BY-4.0 | © Eric Eve | Friends of Inform 7 public library |
| Poor Man's Mistype | Bundled Inform 7 extension (auto-corrects player typos) | CC-BY-4.0 | © Aaron Reed | Friends of Inform 7 public library |
| Smarter Parser | Bundled Inform 7 extension (friendlier parser responses) | CC-BY-4.0 | © Aaron Reed | Friends of Inform 7 public library |
The compiled story file keeps the Inform banner (an Artistic-2.0 condition), and the bundled extensions from the Friends of Inform 7 public library are published under CC-BY-4.0, credited here as the licence requires. Full licence texts: Artistic-2.0 · CC-BY-4.0.
License texts
Apache License 2.0
Used by jsnes and boytacean. Full text: https://www.apache.org/licenses/LICENSE-2.0.
The Apache 2.0 license permits commercial and proprietary use; we retain the
upstream copyright and NOTICE attributions as required.
MIT License
Used by TIC-80 / libtic80.
MIT License
Copyright (c) 2017 Vadim Grigoruk
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.
Uploaded games are licensed by their authors
Games, ROMs, and interactive-fiction files uploaded to wilds.ai remain the property of their respective authors and are distributed under their own terms. wilds.ai only accepts content that is public-domain or that the uploader holds the commercial rights to, and every curated cartridge cites a verifiable license-proof URL. Public-domain and freely-licensed games made by other people are playable but non-earning. See the FAQ for the full eligibility rules.
Everything else
wilds.ai also stands on a large stack of permissively-licensed open-source libraries across its web, runtime, and tooling layers. Their licenses (MIT, Apache-2.0, BSD, ISC, and similar permissive terms) ship with the respective packages in our dependency tree.