add the License.

README.md

@@ -4,8 +4,6 @@
 
 Welcome to DataJoint book, a comprehensive introduction to relational database programming in the context of scientific computing and data science.
 
-
-
 This is a companion book to the [DataJoint Book](https://dimitri-yatsenko.datajoint.io/datajoint-book).
 It contains exercises and assignments for a semester-long course for Database Systems programming.
 The course covers the basic concepts for designing, populating, and querying relational databases.
@@ -15,7 +13,8 @@ The course covers the basic concepts for designing, populating, and querying rel
 © DataJoint Inc., 2024. All rights reserved.
 
 This work is licensed under the [Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License](LICENSE.md).
-You may share the content as long as you give appropriate credit, do not use it for commercial purposes, and do share any modifications.
+You may share the content as long as you give appropriate credit, do not use it for commercial purposes.
+If you make any modifications, you cannot distribute them.
 
 # Contributions 
 We welcome and appreciate your contributions to this book, whether as a reviewer or as a contributor.

book/LICENSE.md

@@ -0,0 +1,29 @@
+---
+title: License
+date: 2024-08-15
+authors:
+  - name: Dimitri Yatsenko
+---
+
+
+© Dimitri Yatsenko, 2024. All rights reserved.
+
+# Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License
+
+By exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License ("Public License"). To the extent this Public License may be interpreted as a contract, You are granted the Licensed Rights in consideration of Your acceptance of these terms and conditions, and the Licensor grants You such rights in consideration of benefits the Licensor receives from making the Licensed Material available under these terms and conditions.
+
+1. License
+You are free to:
+- **Share** — copy and redistribute the material in any medium or format
+
+Under the following terms:
+- **Attribution** — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
+- **NonCommercial** — You may not use the material for commercial purposes.
+- **NoDerivatives** — If you remix, transform, or build upon the material, you may not distribute the modified material.
+
+No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
+
+2. Notices:
+- You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
+- No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
+

book/README.md

@@ -23,7 +23,8 @@ Welcome to **The DataJoint Book**. It book provides a complete introduction to d
 © Dimitri Yatsenko, 2024. All rights reserved.
 
 This work is licensed under the [Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License](LICENSE.md).
-You may share the content as long as you give appropriate credit, do not use it for commercial purposes, and do not share any modifications.
+You may share the content as long as you give appropriate credit, do not use it for commercial purposes.
+If you make  any modifications, you cannot publish or disseminate the modified work.
 
 # Contributions