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Madeira licensing: the assembled iOS app (working document of 2026-09-16, updated 2026-09-24; not legal advice)

This is a working document by the Madeira author, not legal advice. It records what the shipped app contains, under which terms, and which obligations follow. It must be reviewed by an open-source licensing lawyer before any public release.

What one built app contains

Statically linked into the main executable (Madeira / Madeira.debug.dylib):

Component Upstream licence Madeira changes Notes
Wine unix side (ntdll, wineserver, win32u, wineios.drv) from the wine fork (branch madeira-lgpl) and build/*-unix LGPL-2.1-or-later LGPL-2.1-or-later (rebuilt from upstream wine-11.4, see docs/wine-lgpl-provenance.md); the earlier GPL-converted branch is retired statically linked
FEXCore and helpers (FEX/build-ios/*.a), including the rpmalloc fork under FEX/External MIT (rpmalloc: 0BSD) GPL-3.0-or-later + additional permission (Will Faust commits; Ryan Houdek rpmalloc commits stay 0BSD) statically linked
DXMT unix side + airconv (libdxmt_combined.a) MIT GPL-3.0-or-later + additional permission statically linked
LLVM (inside libdxmt_combined.a) Apache-2.0 with LLVM exception none statically linked
gnutls 3.8.9, nettle 3.10.1, hogweed 3.10.1, gmp 6.3.0 LGPL-2.1+ / dual LGPL-3+ or GPL-2+ / dual LGPL-3+ or GPL-2+ none; Madeira elects LGPL-3.0-or-later for the dual-licensed three statically linked; LGPL obligations apply; sources tracked in build/gnutls-ios/src
FFmpeg 7.1.1 (libavformat, libavcodec, libavutil, libswresample) LGPL-2.1-or-later (built --disable-gpl --disable-nonfree --disable-version3) none statically linked, winegstreamer's unix side only; LGPL obligations apply; the unmodified release tarball is tracked in build/ffmpeg/src with its SHA-256 and built by build/ffmpeg/build.sh
Madeira app (Swift/ObjC), native D3D12 runtime (madeira_d3d12.dll, PE) GPL-3.0-or-later + additional permission author-owned
Steam sign-in, owned library and downloads (app/Madeira/SwiftSteam/) derived from Jfishin's Madeira Steam client GPL-3.0-or-later + additional permission, Copyright 2026 Jfishin, 125hz Jfishin's permission: Madeira Discord server, 2026-09-22 ("do whatever you want with it"), seen by Will Faust in that server; he also confirmed that he wrote the depot downloader himself; per-file audit in docs/STEAM_SIGNIN.md and docs/STEAM_LIBRARY.md
Zstandard educational decoder (app/Madeira/SwiftSteam/zstd_edu.c) BSD-3-Clause or GPL-2.0 (Meta Platforms) BSD-3-Clause selected; wrapper by Jfishin licence text in LICENSES/ZSTD-BSD.txt

Dynamically loaded at runtime (dlopen; this is NOT a GPL-compatibility exemption, the combination is still a combined work, see the GNU FAQ on plugins):

Component Licence Notes
libmetalirconverter.dylib (Apple Metal Shader Converter) Apple proprietary; agreement s.2.B permits distribution solely for shader conversion; tracked in the repository (decision 2026-09-16) with the agreement and NOTICE beside it loaded with dlopen by the DXMT/Madeira unix side; used only to convert DXIL to Metal libraries
Apple system frameworks (Metal, Foundation, UIKit, VideoToolbox, CoreMedia, CoreVideo, AudioToolbox, ...) Apple OS components GPL-3 "System Library"
gl/libOSMesa.dylib: Mesa 25.0.7 OSMesa + Zink + softpipe (desktop OpenGL backend) MIT and other permissive licences (licenses/Mesa-license.rst) built by build/mesa-ios/build.sh; Madeira's patches to Mesa (build/mesa-ios/patches) are offered under MIT
gl/libMoltenVK.dylib: MoltenVK 1.4.2, containing SPIRV-Cross, SPIRV-Tools, cereal Apache-2.0 (cereal BSD-3-Clause); texts in licenses/ built by build/moltenvk-ios/build.sh, unmodified; Apache-2.0 is compatible with GPL-3.0
PE DLLs in arm64ec-windows/ (Wine builtins, FEX libarm64ecfex.dll, d3d12.dll, winemetal.dll) as their sources above separate files in the bundle; opengl32.dll is built with patches/wine-opengl-winios.patch applied
compat/love/lua51.dll: LuaJIT 2.1 (x86-64 PE) MIT (licenses/LuaJIT-MIT.txt) unmodified, built by build/luajit-x64/build.sh; loaded in place of an incompatible x64 lua51.dll (game files are not modified)
arm64ec-windows/dockhost.exe (Madeira Dock, when built) GPL-3.0-or-later + additional permission, Copyright 2026 125hz; statically linked LLVM/MinGW-w64 runtime under their own notices separate program run inside Wine; built from the madeira-dock submodule by build/madeira-dock/build.sh, which also writes dock-notices.txt beside it; not committed as a binary
x86_64-opengl/opengl32.dll, libgallium_wgl.dll (Mesa 26.2.4, when built) MIT and the other licences listed in THIRD-PARTY-NOTICES.md; Madeira's two patches GPL-3.0-or-later separate x64 PE files linked over Wine's opengl32 stub; built by build/mesa-d3d12/build.sh; not committed as binaries
x86_64-opengl/dxil.dll (Microsoft DXIL validator, when fetched) Microsoft proprietary (LICENSE-dxil.txt beside it) unmodified; fetched and hash-checked by build/mesa-d3d12/build.sh; not tracked; shipping it is the maintainer's decision

Obligations that follow

  1. GPL-3.0 code combined with the proprietary converter. Allowed only where the copyright holder grants an additional permission. Granted for author-owned code in LICENSE-EXCEPTION.md (adopted 2026-09-24, before the first public push). NOT grantable for upstream Wine code in the GPL-converted fork; hence the LGPL branch.
  2. LGPL components statically linked (Wine on the LGPL branch, gnutls, nettle, hogweed, gmp, FFmpeg). LGPL-2.1 s.6 / LGPL-3 s.4 require, for the combined work: prominent notice that the library is used and covered by the LGPL; a copy of the LGPL; the complete corresponding source of the library and the means to relink the application with a modified library (source of the app can suffice ONLY if a recipient can actually rebuild, re-sign and install it; UNVERIFIED: this needs a clean-machine test covering dependencies, the converter fetch, free-Apple-ID signing, entitlements and installation, and its result recorded here. For the LGPL-3 components (nettle, hogweed, gmp if elected under LGPL-3), LGPL-3 s.4(e) requires "Installation Information" only under the conditions of GPL-3 s.6, i.e. when the combined work is conveyed in or with a User Product and installation in that product is otherwise possible; whether a sideloaded iOS app meets those conditions is a question for the legal review, not assumed either way here. The LGPL-2.1 s.6 relink requirement applies to Wine, gnutls and FFmpeg; object files of the app are the alternative to source); and permission to reverse engineer the combination for debugging modifications. Madeira's licence must not restrict that.
  3. Apple agreement s.2.D: the converter may not be used on non-Apple devices or offered as a service. Madeira runs only on Apple devices.
  4. Notices: keep upstream copyright and licence notices in every fork; ship app/Madeira/d3d12/NOTICE.txt, the Apple agreement text, the Apache text for the headers, COPYING, LICENSE-EXCEPTION.md.

Open items before public release

  • DONE 2026-09-16: the LGPL Wine branch madeira-lgpl is adopted (the wine submodule points at it; code-identical to the GPL branch apart from licence notices, checked by diff).
  • Confirm every downstream Wine patch is author-owned (git authorship is evidence, not proof); note any patch adapted from third-party code.
  • DONE 2026-09-16: election recorded in app/Madeira/licenses/THIRD-PARTY-NOTICES.txt: GnuTLS 3.8.9 LGPL-2.1-or-later; Nettle/Hogweed 3.10.1 and GMP 6.3.0 taken under LGPL-3.0-or-later. Their source tarballs and SHA-256 sums are tracked in build/gnutls-ios/src. The licence texts ship in the bundle.
  • Steam sign-in: Jfishin's permission is a chat message, not a written licence. A public confirmation from him (for example a comment on the pull request that adds app/Madeira/SwiftSteam/) would make it verifiable by anyone; see docs/STEAM_SIGNIN.md.
  • Clean-machine rebuild/relink/install test (see obligation 2): a fresh recursive clone was tried 2026-09-16 and does NOT build unaided; the missing inputs and the reconstructed recipes are in docs/BUILDING.md. Still open: re-executing every UNVERIFIED step there from scratch, then signing and installing.
  • DONE 2026-09-16: the bundle carries licenses/ (GPL-3.0, the exception, LGPL-2.1, LGPL-3.0, MIT, 0BSD, LLVM texts and THIRD-PARTY-NOTICES.txt); build/stage-licenses.sh refreshes the two generated copies and the Xcode build fails if they are stale.
  • Lawyer review of this arrangement.