diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..4c460e0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,17 @@
+Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
+
+Copyright (c) 2024-2026 Luigi D'Acunto
+
+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.
+
+No additional restrictions — You may not apply legal terms or technological
+measures that legally restrict others from doing anything the license permits.
+
+Full license text: https://creativecommons.org/licenses/by-nc/4.0/legalcode
diff --git a/README.md b/README.md
index 7d91015..1d52983 100644
--- a/README.md
+++ b/README.md
@@ -94,4 +94,5 @@ The script injects enhancements at page load and re-applies them on SPA navigati
 
 ## License
 
-MIT — see [LICENSE](LICENSE) if present, otherwise consider it free for any use.
+[CC BY-NC 4.0](LICENSE) — free to use, share, and adapt for non-commercial purposes.
+Commercial use or resale is not permitted.