diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index f15bf82489..4747f0f795 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -19,6 +19,12 @@
     *   Add `ImaAdsLoader.focusSkipButton` to allow apps to request that the
         skip button should receive UI focus, if shown
         ([#8565](https://github.com/google/ExoPlayer/issues/8565)).
+*   DRM:
+    *   Re-use the previous `DrmSessionManager` instance when playing a playlist
+        (if possible)
+        ([#8523](https://github.com/google/ExoPlayer/issues/8523)).
+    *   Propagate DRM configuration when creating media sources for ad content
+        ([#8568](https://github.com/google/ExoPlayer/issues/8568)).
 *   Remove deprecated symbols:
     *   Remove `Player.DefaultEventListener`. Use `Player.EventListener`
         instead.
@@ -26,10 +32,6 @@
         instead.
     *   Remove `extension-jobdispatcher` module. Use the `extension-workmanager`
         module instead.
-*   DRM:
-    *   Re-use the previous `DrmSessionManager` instance when playing a playlist
-        (if possible)
-        ([#8523](https://github.com/google/ExoPlayer/issues/8523)).
 
 ### 2.13.0 (2021-02-04)
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/AdsMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/AdsMediaSource.java
index 4f2617e868..be1ab81cd3 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ads/AdsMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ads/AdsMediaSource.java
@@ -318,8 +318,28 @@ public final class AdsMediaSource extends CompositeMediaSource<MediaPeriodId> {
             && adIndexInAdGroup < adPlaybackState.adGroups[adGroupIndex].uris.length) {
           @Nullable Uri adUri = adPlaybackState.adGroups[adGroupIndex].uris[adIndexInAdGroup];
           if (adUri != null) {
-            MediaSource adMediaSource =
-                adMediaSourceFactory.createMediaSource(MediaItem.fromUri(adUri));
+            MediaItem.Builder adMediaItem = new MediaItem.Builder().setUri(adUri);
+            // Propagate the content's DRM config into the ad media source.
+            @Nullable
+            MediaItem.PlaybackProperties contentPlaybackProperties =
+                contentMediaSource.getMediaItem().playbackProperties;
+            if (contentPlaybackProperties != null
+                && contentPlaybackProperties.drmConfiguration != null) {
+              MediaItem.DrmConfiguration drmConfiguration =
+                  contentPlaybackProperties.drmConfiguration;
+              // TODO(internal b/179984779): Use MediaItem.Builder#setDrmConfiguration() when it's
+              // available.
+              adMediaItem.setDrmUuid(drmConfiguration.uuid);
+              adMediaItem.setDrmKeySetId(drmConfiguration.getKeySetId());
+              adMediaItem.setDrmLicenseUri(drmConfiguration.licenseUri);
+              adMediaItem.setDrmForceDefaultLicenseUri(drmConfiguration.forceDefaultLicenseUri);
+              adMediaItem.setDrmLicenseRequestHeaders(drmConfiguration.requestHeaders);
+              adMediaItem.setDrmMultiSession(drmConfiguration.multiSession);
+              adMediaItem.setDrmPlayClearContentWithoutKey(
+                  drmConfiguration.playClearContentWithoutKey);
+              adMediaItem.setDrmSessionForClearTypes(drmConfiguration.sessionForClearTypes);
+            }
+            MediaSource adMediaSource = adMediaSourceFactory.createMediaSource(adMediaItem.build());
             adMediaSourceHolder.initializeWithMediaSource(adMediaSource, adUri);
           }
         }