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SPDX-FileCopyrightText: 2026 Vetra Automation AB and Ignalina ApS (Rickard Ernst Björn Lundin)
SPDX-License-Identifier: CC-BY-4.0
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# Trademark policy
**"holger"**, the holger name, the holger logo, and the project's visual identity and
official product designations are trademarks owned jointly by **Vetra Automation AB**
and **Ignalina ApS**. All rights in them are reserved.
## The software license is not a trademark license
holger's code is under AGPL-3.0-only and its original documentation under CC-BY-4.0.
**Neither license grants any right to use the holger trademarks.** Trademark rights
are separate from copyright, and are not licensed by this project.
You do **not** need permission to use the "holger" name for ordinary, truthful
references — for example, to state that your project works with holger, is built on
holger, or is a fork of holger. This is nominative, factual use and is fine.
## Forks and derivatives
You are free to fork holger under the AGPL. When you do:
- **You may** truthfully state that your fork is "derived from holger", "based on
holger", or "a fork of holger".
- **You may not** present your fork as an **official** holger release, as endorsed
by or affiliated with Vetra Automation AB or Ignalina ApS, or in a way likely to
confuse users about the source or official status of the software.
- Please **rename** a fork that you distribute or operate as a distinct product,
so users are not misled into thinking it is the official holger. Do not use the
holger logo or visual identity for your fork.
## What requires permission
Using the holger name or logo in a way that suggests official status, endorsement,
or affiliation — in product names, company names, domain names, logos, or
marketing — requires prior written permission from Vetra Automation AB and
Ignalina ApS.
## Not legal advice
This policy is informational and is not legal advice. If you are unsure whether a
particular use is permitted, write to gunnar@gunnar.rs, and obtain your own legal
review where appropriate.