ArcThumb itself is distributed under MIT OR Apache-2.0 (see
LICENSE-MIT and LICENSE-APACHE). The following third-party
components are redistributed with ArcThumb (the arcthumb.dll shell
extension and/or arcthumb-config.exe) and require separate
acknowledgement.
Slint is used as the GUI toolkit for
arcthumb-config.exe under the Slint Royalty-Free License 2.0.
Full license text: https://github.com/slint-ui/slint/blob/master/LICENSES/LicenseRef-Slint-Royalty-free-2.0.md
Attribution: ArcThumb satisfies the Slint Royalty-Free License 2.0
attribution requirement by displaying the AboutSlint widget inside
the About dialog of arcthumb-config.exe (reachable via the
About button in the settings window). The badge shows the Slint
logo and links back to https://slint.dev/.
Slint's own source is not modified and is linked statically into the
binary via the slint crate.
arcthumb.dll embeds an A–Z / 0–9 subset of Roboto Bold
(Copyright 2015 Google Inc.) to draw the format labels in the
identification overlay. Roboto is licensed under the Apache License
2.0.
The subset font and a copy of its license live in assets/fonts/
(Roboto-Bold-subset.ttf, LICENSE-Roboto.txt); the subsetting
command is recorded in assets/fonts/README.md. Only the glyph data
is reduced — the outlines themselves are unmodified.
Other Rust crates used by ArcThumb (both the DLL and
arcthumb-config.exe) are redistributed under their respective MIT,
Apache-2.0, BSD, or similarly permissive licenses. Running
cargo tree --format '{p} {l}' from the repository root will list
every dependency together with its SPDX license identifier.