diff --git a/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java b/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
index 5a577449fa..0454472abf 100644
--- a/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
+++ b/demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java
@@ -628,7 +628,10 @@ public class PlayerActivity extends AppCompatActivity
 
             @Override
             public MediaSourceFactory setDrmSessionManager(DrmSessionManager<?> drmSessionManager) {
-              this.drmSessionManager = drmSessionManager;
+              this.drmSessionManager =
+                  drmSessionManager != null
+                      ? drmSessionManager
+                      : DrmSessionManager.getDummyDrmSessionManager();
               return this;
             }
 
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
index 512fbce4a2..b48e7835ab 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/source/ProgressiveMediaSource.java
@@ -174,7 +174,10 @@ public final class ProgressiveMediaSource extends BaseMediaSource
     @Override
     public Factory setDrmSessionManager(DrmSessionManager<?> drmSessionManager) {
       Assertions.checkState(!isCreateCalled);
-      this.drmSessionManager = drmSessionManager;
+      this.drmSessionManager =
+          drmSessionManager != null
+              ? drmSessionManager
+              : DrmSessionManager.getDummyDrmSessionManager();
       return this;
     }
 
diff --git a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
index dcd4b15cae..39cc03dd12 100644
--- a/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
+++ b/library/dash/src/main/java/com/google/android/exoplayer2/source/dash/DashMediaSource.java
@@ -307,7 +307,10 @@ public final class DashMediaSource extends BaseMediaSource {
     @Override
     public Factory setDrmSessionManager(DrmSessionManager<?> drmSessionManager) {
       Assertions.checkState(!isCreateCalled);
-      this.drmSessionManager = drmSessionManager;
+      this.drmSessionManager =
+          drmSessionManager != null
+              ? drmSessionManager
+              : DrmSessionManager.getDummyDrmSessionManager();
       return this;
     }
 
diff --git a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
index 16dedb6c21..cc2fe618fe 100644
--- a/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
+++ b/library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java
@@ -323,7 +323,10 @@ public final class HlsMediaSource extends BaseMediaSource
     @Override
     public Factory setDrmSessionManager(DrmSessionManager<?> drmSessionManager) {
       Assertions.checkState(!isCreateCalled);
-      this.drmSessionManager = drmSessionManager;
+      this.drmSessionManager =
+          drmSessionManager != null
+              ? drmSessionManager
+              : DrmSessionManager.getDummyDrmSessionManager();
       return this;
     }
 
diff --git a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
index 8cc848dfa4..89dd8039ef 100644
--- a/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
+++ b/library/smoothstreaming/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaSource.java
@@ -273,7 +273,10 @@ public final class SsMediaSource extends BaseMediaSource
     @Override
     public Factory setDrmSessionManager(DrmSessionManager<?> drmSessionManager) {
       Assertions.checkState(!isCreateCalled);
-      this.drmSessionManager = drmSessionManager;
+      this.drmSessionManager =
+          drmSessionManager != null
+              ? drmSessionManager
+              : DrmSessionManager.getDummyDrmSessionManager();
       return this;
     }