update license to [CC BY 4.0]

SageMathOER-CCC · Feb 3, 2025 · d301dec · d301dec
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diff --git a/LICENSE b/LICENSE
@@ -1,5 +1,5 @@
-Creative Commons Attribution-ShareAlike 4.0 International License
+Creative Commons Attribution - International License (CC BY 4.0)
 
-Copyright (c) 2024 Zunaid Ahmed, Hellen Colman, Samuel Lubliner
+Copyright (c) 2024-2025 Zunaid Ahmed, Hellen Colman, Samuel Lubliner
 
-This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit [creativecommons.org/licenses/by-sa/4.0](http://creativecommons.org/licenses/by-sa/4.0).
+This work is licensed under the Creative Commons Attribution-International License. To view a copy of this license, visit [creativecommons.org/licenses/by/4.0/](https://creativecommons.org/licenses/by/4.0/).
diff --git a/source/frontmatter.ptx b/source/frontmatter.ptx
@@ -196,12 +196,12 @@
     </website>
 
     <copyright>
-      <year>2024<ndash /></year>
+      <year>2024<ndash />2025</year>
       <holder>Zunaid Ahmed, Hellen Colman, Samuel Lubliner</holder>
-      <shortlicense> This work is licensed under the Creative Commons Attribution-ShareAlike 4.0
-        International License. To view a copy of this license, visit <url
-          href="http://creativecommons.org/licenses/by-sa/4.0/"
-          visual="creativecommons.org/licenses/by-sa/4.0"> CreativeCommons.org</url>
+      <shortlicense> This work is licensed under the Creative Commons Attribution-International License (CC BY 4.0).
+        To view a copy of this license, visit <url
+        href="https://creativecommons.org/licenses/by/4.0/"
+        visual="creativecommons.org/licenses/by/4.0"> CreativeCommons.org</url>
       </shortlicense>
     </copyright>
   </colophon>