MateEngine Pro License (v2.0)
PROJECT LICENSE
PLEASE READ CAREFULLY
=========================

This license governs the use, modification, distribution, and publication of the MateEngine software and any works derived from it. By using this software, you agree to the following terms:

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### 1. **Grant of Use and Modification**

You are granted the right to use, study, modify, and distribute the MateEngine source code and any derivative works, under the conditions below.

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### 2. **Source Code Disclosure Requirement (Copyleft)**

If you:

* modify the MateEngine source code,
* include it within another application,
* run it as part of a service accessible to others (e.g., multiplayer servers, cloud apps),
* or create a derivative work,

then you **must make the complete, corresponding source code** of your version **publicly available** under the same license. This includes:

* All modified files.
* Any interface code or components required to build and run your version.
* If deployed as a service, the source code corresponding to the running version.

The source must be hosted on a **freely accessible public platform** (such as GitHub, GitLab, Codeberg, or similar) with no paywall or login required to view or download it.

### 2A. **Use as a Library or Engine (Modding Clause)**

You are permitted to use MateEngine as a library or engine to create games, mods, or applications, including by dynamically linking to it or embedding it.

However, the following conditions apply:

* If your project **includes, modifies, or statically links** MateEngine source code, it is considered a **derivative work** and must follow all terms of this license (see Sections 2 and 3).
* If your project **only uses MateEngine as a library** (e.g., via dynamic linking or scripting interfaces), and does **not reuse full classes or methods** of MateEngine directly, then:

* You may license your project under any license you choose,
* **But you must make your project open-source and provide a link to a public code repository (e.g., GitHub)**,
* And you must not misrepresent your project as being officially affiliated with or endorsed by the MateEngine project.
* In all cases, your project must be **non-commercial** and comply with the no-sell restriction (see Section 6).

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### 3. **Redistribution Conditions**

Redistribution of MateEngine or derivative works is allowed under the following conditions:

* It must be under the **MateEngine Pro License**.
* It must be **free of charge**.
* The complete source code must be made publicly available as outlined in section 2.
* Attribution to the original MateEngine authors must be preserved.

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### 4. **Modding and Third-Party Platform Publication**

You may create **mods, extensions, or plugins** for MateEngine and publish them on third-party platforms such as:

* **Steam / Steam Workshop**
* **itch.io**
* **ModDB**
* or similar platforms,

**provided that**:

* The mod or extension is **open-source** and the complete source code is published and linked (e.g., on GitHub).
* The mod is **free of charge** to users.
* The mod includes a notice that it is a modification of MateEngine and retains this license if it uses any MateEngine source code.

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### 5. **External Works**

If your work **does not modify or include** any MateEngine source code (i.e., it is fully external and interacts only via public APIs or interfaces), you may license your work under any terms you wish, **provided** that:

* You do not reuse or copy entire classes, functions, or methods from MateEngine.
* You do not misrepresent your work as being officially affiliated with or endorsed by the MateEngine project.

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### 6. **Commercial Use**

You **may not**:

* Sell MateEngine or any derivative, fork, or modified version.
* Monetize any project that includes or modifies MateEngine source code.
* Offer paid access to services running MateEngine without making your full source code publicly available under this license.

**Commercial use of external, independent mods** (that do not include MateEngine source code) is allowed **only if** MateEngine code is not reused.

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### 7. **No Warranty**

MateEngine is provided “as is”, without warranty of any kind, express or implied, including but not limited to the warranties of merchantability or fitness for a particular purpose.

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### 8. **Termination**

Any breach of this license automatically terminates your rights to use, modify, or distribute MateEngine and any derivative works.

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