In plain language
The summary below is not legal advice and does not replace the full license. It exists to give you a quick mental model of what GPL-v3 grants you and asks of you. For anything that matters, defer to the canonical text linked above.
You may
Use LuminalShine for any purpose, including commercial use. Study how it works. Modify it. Share both original and modified copies.
You must
Provide source code when you redistribute. Keep the same GPL-v3 license on derivative works. Preserve copyright and license notices. State significant changes you’ve made.
You cannot
Sublicense LuminalShine under a non-GPL license, or make a closed-source derivative product. The software is provided without warranty.
Contributions
By submitting a pull request you agree that your contribution is licensed under the same terms as the project — GNU GPL-v3. See the Contributing page for the full process.
LuminalShine remains free and open source and will not be sold or offered commercially.
Third-party components
LuminalShine bundles or depends on several third-party components, each under its own license. A breakdown lives in NOTICE in the repository and in the in-app Legal page.