Estella / ESEngine
Copyright (c) 2024-present ESEngine Team

This product is licensed under the Apache License, Version 2.0 (the "License");
you may not use this product except in compliance with the License. A copy of
the License is provided in the LICENSE file, and the original is available at
<http://www.apache.org/licenses/LICENSE-2.0>.

Estella is free for any use, including commercial use. There is no separate
commercial license and no noncommercial restriction. See BUSINESS_MODEL.md for
how the project is funded and what (optional, separately licensed) hosted and
"pro" add-ons exist alongside the open-source engine.

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Third-Party Components
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This product bundles third-party components under their own licenses. Those
licenses apply only to the corresponding component, not to Estella as a whole,
and Estella's Apache-2.0 license does not extend to them. Each component's full
license text is included in its directory under third_party/.

  Component            Location                          License
  -------------------  --------------------------------  ------------------------
  Box2D                third_party/box2d                 MIT
  GLFW                 third_party/glfw                  zlib/libpng
  GLM                  third_party/glm                   The Happy Bunny / MIT
  nlohmann/json        third_party/nlohmann              MIT
  doctest              third_party/doctest               MIT
  glad                 third_party/glad                  MIT / Public Domain
  cute_tiled           third_party/cute_tiled            zlib / Public Domain
  stb                  third_party/stb                   MIT / Public Domain
  basis_universal      third_party/basis_universal       Apache-2.0
  Yoga                 third_party/yoga                  MIT
  pl_mpeg              third_party/pl_mpeg               MIT
  Spine Runtimes       third_party/spine-runtimes-*      Spine Runtimes License
  DragonBones          third_party/dragonbones           MIT
  RapidJSON            third_party/rapidjson             MIT

The desktop editor additionally bundles an FFmpeg binary (via the ffmpeg-static
npm package; FFmpeg is a trademark of Fabrice Bellard). It is licensed under the
GPL (see the LICENSE file inside the ffmpeg-static package) and is invoked by
the editor's asset cook strictly as a separate external process — it is not
linked into, nor does its license extend to, Estella itself. It does not ship
in exported games. Set ESTELLA_FFMPEG to use a system FFmpeg instead.

IMPORTANT — Spine Runtimes are NOT open source. Relicensing Estella to Apache-2.0
does NOT change this: the Spine Runtimes remain governed by the Spine Runtimes
License Agreement from Esoteric Software (see third_party/spine-runtimes-*/LICENSE).
Any use of the Spine integration — including in otherwise-free commercial games —
requires a valid Spine license obtained directly from Esoteric Software. This
obligation is independent of, and additional to, Estella's own Apache-2.0 license.
If you ship without Spine, this obligation does not apply to you.

Where a bundled component does not carry a top-level license file, its license
header appears in the component's source files.