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xtc/docs/LICENSES.md
hanez b6ba093000 Migrated from Make to CMake.
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Licensing and Dependency Review

The repository's original code, example and documentation are under the MIT license in LICENSE (copyright Johannes Findeisen). No energyXT source, artwork, proprietary SDK, vendored DSP or plugin binary is included. Permissively licensed ABI headers are vendored with their own notices. The source archive contains repository files and an export manifest; it does not bundle system libraries. Installation includes LICENSE and these documents.

The host review inspected installed package metadata and local license files. Package-level license sets can include utilities/docs that differ from the specific library being linked; retain the relevant upstream notices when redistributing dependencies. The default install uses system shared libraries.

Component Inspected license / role
FLTK 1.4.5 LGPL-2.0-only with FLTK exception; optional GUI. /usr/share/licenses/fltk/COPYING contains the linking/subclass exceptions. No local modifications.
PipeWire JACK client library Installed client COPYING is MIT (Wim Taymans); package metadata also lists GPL/LGPL components. No PipeWire binaries are bundled.
Traditional JACK client Alternative backend library commonly LGPL; inspect the actual distribution package instead of assuming PipeWire's license.
glibc/libm LGPL-2.1-or-later library code; package also contains GPL components. System runtime.
libstdc++/libgcc GPL-3.0-or-later with GCC Runtime Library Exception 3.1. System C++ runtime.
Pango/GLib LGPL family; installed Pango metadata LGPL-2.0-or-later. FLTK text stack.
Cairo LGPL-2.1-only OR MPL-1.1. FLTK graphics stack.
Fontconfig HPND AND Unicode-DFS-2016 in inspected package.
FreeType FTL OR GPL-2.0-or-later; distribution can select FTL.
HarfBuzz, Wayland, libdecor, xkbcommon MIT-family licenses; check each shipped package.
X11 libraries MIT/X11-family notices.
D-Bus AFL-2.1 OR GPL-2.0-or-later.
Python 3 PSF-2.0; build/test/package scripts use only the standard library. Not an application runtime dependency.

CMake (BSD-3-Clause), a backend such as Ninja (Apache-2.0) or GNU Make (GPL-3.0-or-later), GCC/Clang, binutils, pkg-config and optional Xvfb/xdotool/sanitizers are build/test tools, not shipped dependencies. New Python tooling needs Python 3.12+ for safe tar extraction in release tests; this host has Python 3.14.8. No packages were installed and no application dependency was added.

Binary redistributors must inspect their own readelf -d/ldd dependency set and supply the notices/source/relinking facilities required by those exact licenses and linking choices. FLTK's exception does not remove obligations of other linked libraries. This review covers the current unmodified system-linked build; static all-in-one bundles and external plugins need a separate review.

LADSPA Review

The optional external host includes the system LADSPA 1.1 header (ladspa 1.17-7), copyright Richard W.E. Furse, Paul Barton-Davis and Stefan Westerfeld, LGPL-2.1-or-later. No header, implementation or plugin binary is copied into the repository. The host uses the glibc dynamic loader (-ldl, LGPL-2.1-or-later), with no discovery/runtime SDK library or new installed package. LADSPA is mature and stable; it does not provide modern instrument/MIDI/opaque-state services. The original fixture in tests/plugins is MIT repository code.

Acceptance dynamically loads the user's installed LADSPA sample amp/sine modules (package metadata LGPL-2.1-or-later) and SWH inverter (swh-plugins 0.4.17-7, GPL-2.0-or-later). Testing/loading a user-installed module does not grant the right to bundle or relicense it. Redistributors must review each chosen module and the combined distribution's obligations separately; xtc's MIT grant covers only its original code. No third-party plugin is included in source archives or installs.

Pinned Header Dependencies

CLAP headers are MIT, copyright Alexandre BIQUE, from upstream commit a47f6badb49d948fd009998f28309cdab78979c9. The generated VST3 C ABI header is BSD-3-Clause, copyright Steinberg Media Technologies GmbH, from commit 93a116f7c6c52a317ec3aaee9b13789068b5234e. Exact licenses are retained under third_party and installed as CLAP-LICENSE / VST3-C-API-LICENSE. These are header specifications only: no external runtime SDK or network build step was added. Review updates explicitly; do not assume future revisions share the same license.

The VST2 compatibility declarations and all three ABI fixtures are original MIT repository code; no Steinberg VST2 SDK or third-party plugin is bundled. Hosting an installed binary is distinct from SDK, trademark and plugin redistribution rights. Review those separately for any proposed distribution. Source archives retain upstream notices; binary installs also ship both header licenses.