<!--
SPDX-FileCopyrightText: 2026 Vetra Automation AB and Ignalina ApS (Rickard Ernst Björn Lundin)
SPDX-License-Identifier: AGPL-3.0-only
-->
# gunnar licensing
gunnar uses a **dual-licensing model**. Read this file together with
[`NOTICE`](NOTICE), [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md),
[`TRADEMARKS.md`](TRADEMARKS.md) and [`COMMERCIAL-LICENSING.md`](COMMERCIAL-LICENSING.md).
## 1. Source code — AGPL-3.0-only
All original gunnar **source code** is licensed under the **GNU Affero General Public
License, version 3 only** (`AGPL-3.0-only`). The complete license text is in
[`LICENSES/AGPL-3.0-only.txt`](LICENSES/AGPL-3.0-only.txt).
gunnar — a pure-Rust git server whose object store is Apache Arrow IPC
inside a znippy archive, with its appliance, console and CLI.
Copyright (C) 2026 Vetra Automation AB and Ignalina ApS (Rickard Ernst Björn Lundin)
(jointly owned in equal shares, 50/50)
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License, version 3, as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Because gunnar is offered under AGPL-3.0-**only**, the "or (at your option) any
later version" clause does **not** apply.
## 2. Original documentation — CC-BY-4.0
Original gunnar **documentation** (the prose and diagrams authored by the gunnar
project, e.g. files under `docs/` and Markdown guides, unless a file's own header
says otherwise) is licensed under the **Creative Commons Attribution 4.0
International License** (`CC-BY-4.0`). The full text is in
[`LICENSES/CC-BY-4.0.txt`](LICENSES/CC-BY-4.0.txt).
CC-BY-4.0 applies to documentation **only**. It does **not** apply to source code.
Code embedded in documentation (examples, snippets) is offered under the code
license (AGPL-3.0-only) so it can be copied into programs.
## 3. Trademarks — not licensed here
Neither the AGPL nor CC-BY grants any rights in the **gunnar** name, logo, or visual
identity. All such rights are reserved jointly by Vetra Automation AB and
Ignalina ApS. See
[`TRADEMARKS.md`](TRADEMARKS.md).
## 4. Third-party components — their own licenses
gunnar includes third-party components (including vendored dependencies under
`vendor/`) that remain under **their own licenses**. gunnar as a combined work is
distributed under AGPL-3.0-only, but each third-party component keeps its original
license and copyright. See [`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).
The Vetra Automation AB and Ignalina ApS copyright does **not** extend to third-party files.
## 5. Commercial licensing — available separately
The AGPL's network-copyleft obligations do not suit every organization. Vetra
Automation AB and Ignalina ApS, who own the original code jointly in equal shares
(50/50), can together offer the **same code under separate commercial terms**. This
is a possibility, not an automatic grant: no commercial license exists until both
co-owners and the licensee execute a written agreement. See [`COMMERCIAL-LICENSING.md`](COMMERCIAL-LICENSING.md).
## 6. Not legal advice
This file and the accompanying legal documents are informational and are **not
legal advice**. AGPL-3.0-only imposes real obligations (including source-availability
for users who interact with the software over a network). Organizations should obtain
their own legal review before deploying, modifying, or redistributing gunnar.
---
SPDX summary: `AGPL-3.0-only` (code) · `CC-BY-4.0` (original docs). Per-file
`SPDX-License-Identifier` headers are authoritative where present.