Rename LICENSE to LICENSE.md

LICENSE

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-Custom License - Non-Commercial Research Use Only
-
-This dataset contains historical financial time series data collected via the yfinance Python library, which retrieves public market data from Yahoo Finance.
-
-These data remain the property of their respective original sources and are provided here strictly for non-commercial research and educational purposes.
-
-Redistribution of this dataset may be limited by the terms of the original data providers.
-
-NO WARRANTY IS PROVIDED. USE AT YOUR OWN RISK.
-
-For any intended use beyond private research, please consult the terms of Yahoo Finance and other data providers.

LICENSE.md

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+# License
+
+This dataset is licensed under the **Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)**.
+
+You are free to:
+- **Share** — copy and redistribute the material in any medium or format.
+- **Adapt** — remix, transform, and build upon the material.
+
+Under the following terms:
+- **Attribution** — You must give appropriate credit, provide a link to the license, and indicate if changes were made.
+- **NonCommercial** — You may not use the material for commercial purposes.
+- **ShareAlike** — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
+
+👉 [Full legal code of CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode)
+
+---
+
+## ⚠️ IMPORTANT DATA SOURCE DISCLAIMER
+
+This dataset contains historical financial time series data collected via the `yfinance` Python library, which retrieves public market data from Yahoo Finance.
+
+1. **No Ownership of Raw Data:** These data remain the property of their respective original sources and are provided here strictly for non-commercial research and educational purposes.
+2. **Third-Party Terms:** Redistribution of this dataset may be limited by the terms of the original data providers.
+3. **No Warranty:** NO WARRANTY IS PROVIDED. USE AT YOUR OWN RISK.
+4. **Commercial Use:** For any intended use beyond private research, please consult the terms of Yahoo Finance and other data providers directly.