PROPRIETARY SOFTWARE LICENSE — EUER-DATEV

Copyright (c) 2026 Markus Keller. All rights reserved in the original euer-datev code.

1. Scope
This license applies to the original euer-datev software and documentation. Third-party
components are excluded and remain under their respective licenses. See
THIRD_PARTY_NOTICES.md. Where terms conflict for a third-party component, that component's
own license takes precedence. Nothing in this license restricts rights to use, copy,
modify, redistribute or obtain source code granted by a third-party license or mandatory
applicable law.

2. Permitted use
You may install and use lawfully obtained, unmodified releases. The free features and the
evaluation allowance (exporting test batches with up to five source transactions, "Evaluation Mode")
supplied with the release may be used without purchasing a key for testing and compatibility
evaluation. Productive use beyond that allowance requires a valid commercial DATEV or combined
product license key covering the exported tax year. A paid key grants the corresponding usage
rights; it does not transfer copyright or ownership.

You may make installation and backup copies. Unmodified official release packages may be
redistributed with this license and all third-party notices intact. This permission allows
distribution through PyPI, package mirrors, and the official Homebrew tap. It does not permit
redistribution of another person's commercial license keys.

3. Reserved rights
Except for the permissions above or a separate written agreement with the copyright holder,
no permission is granted to modify, relicense or distribute modified versions of the original
proprietary euer-datev code, or to bypass its license enforcement. These restrictions do not
apply to the excluded third-party components or limit non-waivable statutory rights.

4. Warranty and liability
To the extent permitted by applicable law, the software is provided "AS IS" without warranties
of merchantability, fitness for a particular purpose, or non-infringement. In no event shall the
copyright holder be liable for any claim, damages, or other liability arising from the use of the
software. Mandatory statutory rights and liabilities under applicable German law remain unaffected.
Third-party authors provide their components under their own disclaimers.
