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LICENSING.md

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+# Licensing — marvy-1-14B
+
+marvy-1-14B uses a **layered (dual) license** that reflects what is built on top
+of an upstream open model versus what MainStack authored.
+
+| Component | License | What it covers |
+|---|---|---|
+| **Model weights** (`*.safetensors`, GGUF quants, LoRA adapter) | **Apache-2.0** | The fine-tuned weights. These are a derivative of Qwen2.5-14B-Instruct (Apache-2.0); per that license they remain Apache-2.0 and free to use, modify, and redistribute. |
+| **MainStack original contributions** | **CC-BY-4.0** | The model cards, documentation (`USAGE.md`, `VALIDATION.md`, benchmark), the benchmark charts, the curated training-data methodology, and the pipeline framing authored by MainStack. |
+
+## What this means in practice
+
+### You may (under Apache-2.0, for the weights)
+- Use marvy-1-14B commercially, privately, or in research.
+- Fine-tune, distill, quantize, merge, or otherwise build on the weights.
+- Redistribute the weights, including modified versions.
+
+…provided you **retain the `NOTICE` file** in derivatives and redistributions
+(Apache-2.0 §4(d) — this is mandatory and carries the attribution request).
+
+### You must (under CC-BY-4.0, for our contributions)
+If you reuse MainStack's **documentation, model cards, benchmark, or charts** —
+e.g. copying our eval methodology, reproducing our charts, or lifting card text
+into your own model — you must give **attribution**: credit "MainStack" and link
+to https://huggingface.co/MainStack/marvy-1-14B. This is a binding condition of
+CC-BY-4.0, not just a request.
+
+### We ask (attribution for the model)
+If you use marvy-1-14B **as a baseline, a starting point for your own fine-tune,
+a distillation source, or an evaluation comparison**, please credit MainStack
+and cite the entry in the model card. See `NOTICE` and the card's Citation
+section.
+
+## Why the weights can't be more restricted
+
+Qwen2.5-14B-Instruct is released under Apache-2.0, which grants every recipient
+an irrevocable, royalty-free right to use and redistribute. A fine-tune cannot
+revoke those rights on the resulting weights. MainStack's protection therefore
+lives where it legally can: (1) the CC-BY-4.0 license on our **own** authored
+materials, and (2) the Apache-2.0 **NOTICE** that must travel with the weights.
+
+## Files
+- `LICENSE` — Apache-2.0 (governs the weights; inherited from the base model).
+- `LICENSE-CC-BY-4.0` — CC-BY-4.0 (governs MainStack's documentation and other
+  original contributions).
+- `NOTICE` — required attribution notices (retain in derivatives).
+- `CITATION.cff` — citation metadata.