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ProjectUltra Licensing

ProjectUltra source code is distributed under the MIT License. See LICENSE.

All bundled third-party libraries are under permissive licenses (MIT, BSD-3-Clause, zlib, Apache 2.0) compatible with redistribution under MIT. Hamlib (LGPL 2.1+) is dynamically linked only and follows the substitution exception described below.

Vendored sources (in thirdparty/)

  • PocketFFT — BSD-3-Clause. Header-only; see thirdparty/pocketfft/LICENSE.md.
  • Dear ImGui — MIT. See thirdparty/imgui/LICENSE.txt.
  • miniz — public domain / MIT dual. See thirdparty/miniz/.
  • stb — public domain / MIT dual. See thirdparty/stb/.

Runtime libraries (bundled into release binaries)

  • SDL2 — zlib license. Bundled in macOS, Linux, and Windows operator bundles when the package script can locate the built binary's SDL2 runtime dependency.
  • Hamlib (libhamlib) — LGPL 2.1+ (or later). Dynamically linked into ultra_gui and ultra_tnc when built with ULTRA_USE_LIBHAMLIB=ON. The Windows release bundle ships the prebuilt 4.7.1 runtime DLLs (libhamlib-4.dll plus libusb-1.0.dll, libgcc_s_seh-1.dll, libwinpthread-1.dll) alongside the binary; the full LGPL text is included as COPYING.LIB.txt in the same directory. Upstream source: https://github.com/Hamlib/Hamlib. To exercise the LGPL substitution right, replace the shipped libhamlib-4.dll with your own build of the same major version. The Hamlib utility binaries (rigctld, rigctl) are GPL 2+ and are NOT redistributed by this project; operators install them separately if they want the rigctld TCP backend.

OTASim server / client runtime dependencies (since 2026-05-17)

ota_simulator, ota_simulator serve, and (after Task 05+) ultra_gui, ultra_tnc, and cli_simulator link against the following libraries for the gRPC + protobuf control plane and the UDP audio plane:

These dependencies are sourced from system package managers (Homebrew on macOS, apt/yum on Linux, vcpkg/MSYS2 on Windows) and are NOT vendored into this repo. For binary release bundles:

  • Linux / Windows: if these libraries are statically linked into the shipped binary or bundled as DLLs/.so alongside it, the corresponding upstream LICENSE and (for Apache 2.0 deps) NOTICE files MUST be included in the release archive.
  • macOS: if dynamically linked against the user's existing Homebrew installation (the default), no additional bundling is required — the user obtained the libraries with their own brew install and received the licenses with that install. If the release ships its own static builds or .dylibs, the same bundling rules as Linux apply.

When the release CI/packaging script (packaging/package_operator_bundle.sh and .github/workflows/build-matrix.yml) is extended to include gRPC and its dependencies, the packaging step MUST also copy the upstream LICENSE + NOTICE files into the release bundle for any statically linked or co-shipped library. See https://www.apache.org/licenses/LICENSE-2.0 for the Apache 2.0 attribution requirements.