libvkd3d.so.1, libvkd3d-shader.so.1, libvkd3d-utils.so.1: upstream vkd3d (Wine project), LGPL-2.1 (vkd3d-COPYING.txt, vkd3d-LICENSE.txt, vkd3d-AUTHORS.txt), unmodified, built with zig cc for glibc 2.31. Complete source: ../source/vkd3d-2.1.tar.xz (the official release tarball, SHA-256 7510146aff2adfb4ae07ab890701a607e5ff7c66e57100cfc9f630ec92eeda6a, also at https://dl.winehq.org/vkd3d/source/) and ../source/build_vkd3d_zig.sh (the build script used). The game loads these libraries at run time (dlopen): any interface-compatible build can replace them.
linux/sdl2/include: the SDL2 headers (zlib license, https://libsdl.org); linux/sdl2/lib/libSDL2-2.0.so.0 is a link-time stub with no code (packaging/linux/make_sdl2_kit.sh): the game loads the system's SDL2.
linux/lib/fallback/libSDL2-2.0.so.0 (when present): upstream SDL2 (zlib license, SDL2-LICENSE.txt), built with zig for glibc 2.31 (packaging/linux/build_sdl2_zig.sh); only used where the system has no SDL2.
