Update README.md

README.md

@@ -35,6 +35,8 @@ This dataset is a curated subset of high-quality problems across mathematics and
     - Programming competition resources (CodeContest, TACO, APPS)
     - All problems include validated "Accepted" solutions and test cases
 
+**Note**: Only a partial subset of the complete dataset is publicly released due to third-party data licensing restrictions and procurement agreements. The published portion has been carefully selected to comply with all copyright requirements while maintaining research utility.
+
 ## Dataset Construction
 
 ### Data Sources