fix license

README.md

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-# Zmodn: Practical Modular Arithmetic Using NumPy
 
 The Zmodn package provides a class for representing elements in the ring of integers modulo n $(Z/nZ)$. It offers operations for modular arithmetic and matrix operations over this ring, making it useful for applications such as cryptography and computer algebra.
 
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 ## License
 
-Zmodn is licensed under the terms of the MIT license. See the [license file](https://github.com/asanchezyali/zmodn/blob/main/LICENSE) for details.
+Zmodn is licensed under the terms of the Creative Commons Zero v1.0 Universal license. See the [license file](https://github.com/asanchezyali/zmodn/blob/main/LICENSE) for details.
 
 ## Contact