Clarify licensing information, note GPL dependencies and built objects

LICENSE-MIT

@@ -1,4 +1,4 @@
-Copyright 2023 Gergő Sályi
+Copyright 2023 Gergő Sályi and multibg-sway 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

PKGBUILD

@@ -5,7 +5,8 @@ pkgrel=1
 pkgdesc='Set a different wallpaper for the background of each Sway workspace'
 arch=('x86_64' 'i686' 'pentium4' 'armv7h' 'aarch64')
 url="https://github.com/gergo-salyi/multibg-sway"
-license=('MIT' 'Apache')
+# Direct source files are MIT OR Apache-2.0 but have GPL-3.0-or-later dependencies
+license=('GPL-3.0-or-later')
 depends=('dav1d>=1.3.0' 'gcc-libs' 'glibc')
 makedepends=('cargo')
 optdepends=(
@@ -35,5 +36,4 @@ package() {
     cd "$pkgname-$pkgver"
     install -Dm0755 -t "$pkgdir/usr/bin/" "target/release/$pkgname"
     install -Dm644 "README.md" "$pkgdir/usr/share/doc/${pkgname}/README.md"
-    install -Dm644 "LICENSE-MIT" "$pkgdir/usr/share/licenses/${pkgname}/LICENSE-MIT"
 }

README.md

@@ -100,3 +100,9 @@ Please include a verbose log from you terminal by running with `RUST_BACKTRACE=1
 - [hyprpaper](https://github.com/hyprwm/hyprpaper)
 - [mpvpaper](https://github.com/GhostNaN/mpvpaper)
 - [oguri](https://github.com/vilhalmer/oguri)
+
+## License
+
+Source files in this project are distributed under MIT OR Apache-2.0
+
+Objects resulting from building this project might be under GPL-3.0-or-later due to licenses of statically linked dependencies. Open an issue if you need compile time features gating such dependencies.

scripts/cargo-tree-licences-not-mit.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+set -euo pipefail
+cargo tree --prefix none --format '{p} {l}' | grep --invert-match -e 'MIT'