Replace all display-name occurrences across web pages, Rust source, docs, and Cargo metadata. Update localStorage token key from sq_token to fs_token. Tagline "Klondike Solitaire" retained as genre descriptor. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Credits
Ferrous Solitaire is MIT-licensed (see LICENSE). It is built on top of
the work of many open-source projects and a small handful of third-party
assets. This file lists every component that ships in the binary or in the
assets/ directory.
Code & Framework
| Component | License | Role |
|---|---|---|
| Bevy 0.18 | MIT OR Apache-2.0 | Game engine, ECS, rendering, UI |
| kira 0.12 | MIT OR Apache-2.0 | Audio playback (mixer, sub-tracks, looping ambient) |
| serde / serde_json | MIT OR Apache-2.0 | Serialization for save files and the sync API |
| tokio | MIT | Async runtime for the sync client and server |
| axum 0.8 | MIT | HTTP framework for the self-hosted sync server |
| sqlx 0.8 | MIT OR Apache-2.0 | Compile-time-checked SQLite access on the server |
| reqwest 0.13 | MIT OR Apache-2.0 | HTTP client for the sync provider |
| jsonwebtoken 10 | MIT | JWT issuance and validation |
| bcrypt 0.19 | MIT | Password hashing on the server |
| keyring 4 | MIT OR Apache-2.0 | OS keychain integration for credential storage |
| tower-governor 0.8 | MIT | Rate limiting on /api/auth/* |
| chrono | MIT OR Apache-2.0 | Date / time handling |
| uuid | MIT OR Apache-2.0 | User and session identifiers |
| thiserror | MIT OR Apache-2.0 | Error type derive |
| rand 0.9 | MIT OR Apache-2.0 | Seeded shuffler in solitaire_core |
| png 0.17 | MIT OR Apache-2.0 | PNG encoder used by solitaire_assetgen |
| ab_glyph 0.2 | Apache-2.0 | Glyph rasterization for generated card art |
The full transitive dependency tree (several hundred crates) is captured in
Cargo.lock and reachable via cargo tree. Every crate brought in is
MIT, Apache-2.0, BSD-style, or a dual-licensed combination thereof — no
copyleft code is statically linked into the game binary.
Assets
Card artwork
| File(s) | Source | License |
|---|---|---|
solitaire_engine/assets/themes/default/{suit}_{rank}.svg (52 SVGs) |
hayeah/playing-cards-assets | MIT |
solitaire_engine/assets/themes/default/back.svg |
Original — Ferrous Solitaire | MIT (this project) |
assets/cards/faces/{RANK}{SUIT}.png (52 PNGs) |
Pre-rendered from the same playing-cards-assets SVGs |
MIT (passed through from hayeah) |
assets/cards/backs/back_0.png – back_4.png |
Original — generated by solitaire_assetgen::gen_art |
MIT (this project) |
The face SVGs come from Howard Yeh's playing-cards-assets repository, which
is itself derived from the public-domain vector-playing-cards Google Code
project. The art is redistributed under the MIT license — see the upstream
repository for the full notice. The files ship unmodified in the bundled
default theme; user-supplied themes can override them per-installation
through the runtime SVG theming system documented in CARD_PLAN.md.
The default card back is original work by this project, midnight-purple themed to match the rest of the UI palette.
Backgrounds
| File(s) | Source | License |
|---|---|---|
assets/backgrounds/bg_0.png – bg_4.png |
Original — generated by solitaire_assetgen::gen_art |
MIT (this project) |
Typography
| File | Source | License |
|---|---|---|
assets/fonts/main.ttf (FiraMono-Medium) |
mozilla/Fira | SIL Open Font License 1.1 |
The OFL permits redistribution and embedding in software so long as the font file itself is not sold standalone. The file ships unmodified.
Audio
All six WAV files in assets/audio/ are original work — there are no
third-party audio samples in this project. They are synthesized
programmatically by solitaire_assetgen/src/bin/gen_sfx.rs, which writes
44.1 kHz mono 16-bit PCM WAVs using a hand-rolled WAV writer (no hound or
dasp dependency). The synthesis stack is entirely additive: sine /
square waves, layered harmonics, deterministic LCG noise, AR envelopes,
and a slow LFO for the ambient track.
| File | Synthesis approach |
|---|---|
card_deal.wav |
Filtered LCG noise with a sweeping low-pass cutoff for a "whoosh" |
card_flip.wav |
High-passed LCG noise under a fast AR envelope |
card_place.wav |
120 Hz sine body + filtered noise click |
card_invalid.wav |
Two dissonant square tones (196 Hz + 207.65 Hz) beating against each other |
win_fanfare.wav |
C-major arpeggio (C5 / E5 / G5 / C6) with sine + 2nd harmonic |
ambient_loop.wav |
55 Hz fundamental with 2nd and 3rd harmonics, modulated by a 0.2 Hz LFO; loop length is chosen so the tone and LFO both complete an integer number of cycles for seamless looping |
Audio files are MIT-licensed alongside the rest of this project.
License Summary
- Project code: MIT — see LICENSE.
- Card face artwork (52 SVGs from hayeah/playing-cards-assets, plus the
pre-rendered PNGs in
assets/cards/faces/): MIT, redistributed unmodified. The originalvector-playing-cardsline art is itself public domain. - FiraMono-Medium font: SIL Open Font License 1.1, redistributed unmodified.
- All other assets (backgrounds, the default
back.svg, generated card backs, every audio file) are original work covered by this project's MIT license.
If you redistribute Ferrous Solitaire, you must ship this CREDITS.md and the
LICENSE file alongside the binary so the MIT (project + hayeah card art)
and OFL (FiraMono) notices remain visible to end users.