Add Attribution & takedown section

README.md

@@ -182,4 +182,22 @@ high_quality = train.filter(lambda x: x["quality_tier"] in ("A", "B"))
 
 ## License
 
-Apache 2.0
+Apache 2.0
+
+## Attribution & takedown
+
+Portions of this dataset derive from publicly available code
+repositories (natively-authored code scraped from public GitHub and Gitee
+repositories, plus community contributions collected with consent via
+the collection Space), collected under a best-effort license review. If you are the author of code
+included here and believe it was included improperly, or you would
+like attribution added or your code removed:
+
+- open a discussion on this repository's **Community** tab, or
+- email Madi Edgar at **support@legesher.com** (the maintainer listed in
+  `CITATION.cff`).
+
+We commit to citing, and on request from authors removing, any source
+identified as improperly included. Removals are propagated in a new
+dataset revision; prior revisions remain in git history unless a
+takedown requires otherwise.