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LICENSE_BREAKDOWN.md

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+# License Breakdown
+
+The Scandium Dataset is a **multi-source compilation** with **different licenses applying to different entries**. There is no single license that covers the entire dataset.
+
+## Per-Source License
+
+| Source | Entries | License | Commercial Use | Redistribution |
+|--------|---------|---------|----------------|----------------|
+| Materials Project (MP) | 69,279 (26.0%) | **CC BY 4.0** | ✅ Yes | ✅ With attribution |
+| JARVIS-DFT | 25,673 (9.6%) | **CC0 1.0** (Public Domain) | ✅ Yes | ✅ Unlimited |
+| OQMD | 171,780 (64.4%) | **OQMD Non-Commercial** | ❌ No | ✅ Non-commercial with attribution |
+
+## How to Find the License for a Given Entry
+
+Every entry in the dataset includes a `license` field. Filter by it:
+
+```python
+import json
+
+with open("entries_final_v3.json") as f:
+    entries = json.load(f)
+
+# Get only commercially-safe entries (MP + JARVIS)
+commercial_safe = [e for e in entries if e["license"] != "OQMD-noncommercial"]
+print(f"{len(commercial_safe)} entries are commercially safe")
+```
+
+## Commercial-Safe Subset
+
+If you need a dataset free of OQMD non-commercial restrictions, use only:
+
+- **MP entries** (CC BY 4.0) — 69,279 entries
+- **JARVIS entries** (CC0) — 25,673 entries
+
+**Total: 94,952 entries (35.6% of full dataset)**
+
+## License Texts
+
+### CC BY 4.0
+Applies to: Materials Project entries + Scandium processing code/documentation
+- https://creativecommons.org/licenses/by/4.0/
+- Attribution required to "Materials Project" (Jain et al., APL Materials, 2013)
+
+### CC0 1.0 (Public Domain)
+Applies to: JARVIS-DFT entries
+- https://creativecommons.org/publicdomain/zero/1.0/
+- NIST Public Domain. No attribution required (though appreciated).
+
+### OQMD Non-Commercial
+Applies to: OQMD entries
+- https://oqmd.org/about
+- Free for non-commercial use only
+- Attribution required to "OQMD" (Saal et al., JOM, 2013; Kirklin et al., npj Comp. Mater., 2015)
+
+## Important Notes
+
+1. **The merged file is NOT uniformly CC-BY-4.0.** If you redistribute the merged dataset, you must respect the most restrictive license present (OQMD non-commercial).
+2. **Do not use the top-level "cc-by-4.0" badge** as a substitute for reading this breakdown.
+3. **Scandium processing, quality scoring, and documentation** are CC BY 4.0 regardless of source.
+4. This breakdown is not legal advice. Consult a lawyer for your specific use case.