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README.md

@@ -1,5 +1,5 @@
 ---
-license: cc-by-4.0
+license: cc-by-sa-4.0
 task_categories:
   - object-detection
   - image-classification
@@ -148,5 +148,11 @@ Regenerate this layout from the source repo with `npm run dataset:export`.
 
 ## License
 
-**CC BY 4.0.** The [dieCamera](https://github.com/eschatus/diecamera) application code is
-MIT and separate.
+**CC BY-SA 4.0.** Share-alike: any redistribution or derivative dataset built from this
+corpus must carry attribution and the same license forward. The
+[dieCamera](https://github.com/eschatus/diecamera) application code is licensed separately
+(see its own repo).
+
+*(Provisional — this replaces an earlier CC BY 4.0 license on this card, to match the
+"opt-in, copyleft" data-sharing terms agreed in principle on Aug 6. Not yet cleared by
+counsel.)*