diff --git a/simulator/static/credits.html b/simulator/static/credits.html
index 79b4646..4168485 100644
--- a/simulator/static/credits.html
+++ b/simulator/static/credits.html
@@ -13,12 +13,30 @@
       <p><a href="index.html" class="back-link">← Back to the experience</a></p>
     </header>
 
+    <!-- Option D1: the altered work's own license + the "modified" statement that
+         CC BY / CC BY-SA attribution requires. Heading deliberately NOT "About" — the
+         separate About page covers the project's intent. -->
+    <section class="declaration">
+      <h2>License &amp; reuse</h2>
+      <p>
+        The <em>Human Experience Filter</em> alters its source footage in real time
+        (overlays, an emotion/affect channel, and a WebGL “dream” shader), so every
+        frame you see is a <strong>derivative</strong> of the original clip.
+      </p>
+      <p>
+        This altered work is offered under
+        <a href="https://creativecommons.org/licenses/by-sa/4.0/" rel="license">Creative
+        Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0)</a>. The original sources it
+        builds on are credited below. This is a non-commercial art installation.
+      </p>
+    </section>
+
     <section>
       <h2>Footage</h2>
       <p class="note">
         Original video sources and their licenses. Public-domain (US-government) and
         CC0 clips need no attribution; the names below for CC BY / CC BY-SA clips are
-        required credit. All footage is altered in real time in the experience.
+        required credit. All footage is altered as described above.
       </p>
       <div id="video-credits" class="credits-list">
         <p class="loading">Loading credits…</p>
diff --git a/simulator/unit/credits.test.js b/simulator/unit/credits.test.js
index 232bc5a..8ae831f 100644
--- a/simulator/unit/credits.test.js
+++ b/simulator/unit/credits.test.js
@@ -55,10 +55,12 @@ test("credits.html wires config.js + credits.js, the attributions container, and
   assert.match(html, /href="index\.html"/);           // back into the experience
 });
 
-test("credits.html notes footage is altered; the work-license declaration lives on the About page", () => {
+test("credits.html carries the CC BY-SA derivative declaration (Option D1)", () => {
   const html = fs.readFileSync(path.join(__dirname, "../static/credits.html"), "utf8");
-  assert.match(html, /altered/i);                      // modification indicated alongside the attributions
-  // The CC BY-SA work-license declaration ("About this work") moved off the credits
-  // page onto the About page — it must NOT be duplicated here.
-  assert.doesNotMatch(html, /CC BY-SA 4\.0/);
+  assert.match(html, /CC BY-SA 4\.0/);                 // the altered work's own license
+  assert.match(html, /altered/i);                      // states the footage is modified
+  // The section is NOT titled "About this work" — that name belongs to the separate
+  // About page; here the declaration lives under "License & reuse".
+  assert.doesNotMatch(html, /About this work/i);
+  assert.match(html, /License &amp; reuse/);
 });
diff --git a/tests/test_e2e_credits.py b/tests/test_e2e_credits.py
index 8756aec..3023039 100644
--- a/tests/test_e2e_credits.py
+++ b/tests/test_e2e_credits.py
@@ -68,9 +68,7 @@ def test_credits_page_lists_video_attributions(browser_page):
     body = page.inner_text("body")
     assert "NASA, ESA, CSA, STScI" in body
     assert "Joe Mabel" in body          # a CC BY-SA clip's required author credit
-    # The CC BY-SA work-license declaration ("About this work") moved to the About
-    # page — it is intentionally no longer on the credits page.
-    assert "CC BY-SA 4.0" not in body
+    assert "CC BY-SA 4.0" in body       # the Option-D1 derivative declaration ("License & reuse")
 
 
 def test_experience_links_to_credits(browser_page):