diff --git a/packager/mpd/base/mpd_notifier.h b/packager/mpd/base/mpd_notifier.h
index 27b0a29543..8b81631a17 100644
--- a/packager/mpd/base/mpd_notifier.h
+++ b/packager/mpd/base/mpd_notifier.h
@@ -58,8 +58,8 @@ class MpdNotifier {
   virtual bool NotifySampleDuration(uint32_t container_id,
                                     uint32_t sample_duration) = 0;
 
-  /// Notifies MpdBuilder that there is a new segment ready. Used only for live
-  /// profile.
+  /// Notifies MpdBuilder that there is a new segment ready. For live, this
+  /// is usually a new segment, for VOD this is usually a subsegment.
   /// @param container_id Container ID obtained from calling
   ///        NotifyNewContainer().
   /// @param start_time is the start time of the new segment, in units of the
diff --git a/packager/mpd/base/simple_mpd_notifier.cc b/packager/mpd/base/simple_mpd_notifier.cc
index 4241da533f..cefee2a64f 100644
--- a/packager/mpd/base/simple_mpd_notifier.cc
+++ b/packager/mpd/base/simple_mpd_notifier.cc
@@ -66,12 +66,11 @@ bool SimpleMpdNotifier::NotifyNewContainer(const MediaInfo& media_info,
   // generate a valid MPD.
   AddContentProtectionElements(media_info, representation);
   *container_id = representation->id();
+  DCHECK(!ContainsKey(representation_map_, representation->id()));
+  representation_map_[representation->id()] = representation;
 
   if (mpd_builder_->type() == MpdBuilder::kStatic)
     return WriteMpdToFile(output_path_, mpd_builder_.get());
-
-  DCHECK(!ContainsKey(representation_map_, representation->id()));
-  representation_map_[representation->id()] = representation;
   return true;
 }
 
@@ -83,8 +82,10 @@ bool SimpleMpdNotifier::NotifySampleDuration(uint32_t container_id,
     LOG(ERROR) << "Unexpected container_id: " << container_id;
     return false;
   }
+  // This sets the right frameRate for Representation or AdaptationSet, so
+  // write out the new MPD.
   it->second->SetSampleDuration(sample_duration);
-  return true;
+  return WriteMpdToFile(output_path_, mpd_builder_.get());
 }
 
 bool SimpleMpdNotifier::NotifyNewSegment(uint32_t container_id,
@@ -92,12 +93,13 @@ bool SimpleMpdNotifier::NotifyNewSegment(uint32_t container_id,
                                          uint64_t duration,
                                          uint64_t size) {
   base::AutoLock auto_lock(lock_);
-
   RepresentationMap::iterator it = representation_map_.find(container_id);
   if (it == representation_map_.end()) {
     LOG(ERROR) << "Unexpected container_id: " << container_id;
     return false;
   }
+  // For live, the timeline and segmentAlignment gets updated. For VOD,
+  // subsegmentAlignment gets updated. So write out the MPD.
   it->second->AddNewSegment(start_time, duration, size);
   return WriteMpdToFile(output_path_, mpd_builder_.get());
 }
@@ -105,8 +107,14 @@ bool SimpleMpdNotifier::NotifyNewSegment(uint32_t container_id,
 bool SimpleMpdNotifier::AddContentProtectionElement(
     uint32_t container_id,
     const ContentProtectionElement& content_protection_element) {
-  NOTIMPLEMENTED();
-  return false;
+  base::AutoLock auto_lock(lock_);
+  RepresentationMap::iterator it = representation_map_.find(container_id);
+  if (it == representation_map_.end()) {
+    LOG(ERROR) << "Unexpected container_id: " << container_id;
+    return false;
+  }
+  it->second->AddContentProtectionElement(content_protection_element);
+  return WriteMpdToFile(output_path_, mpd_builder_.get());
 }
 
 }  // namespace edash_packager
diff --git a/packager/mpd/base/simple_mpd_notifier_unittest.cc b/packager/mpd/base/simple_mpd_notifier_unittest.cc
index f8a1294643..19a45bbc1f 100644
--- a/packager/mpd/base/simple_mpd_notifier_unittest.cc
+++ b/packager/mpd/base/simple_mpd_notifier_unittest.cc
@@ -133,6 +133,7 @@ TEST_F(SimpleMpdNotifierTest, LiveNotifySampleDuration) {
       .WillOnce(Return(default_mock_adaptation_set_.get()));
   EXPECT_CALL(*default_mock_adaptation_set_, AddRepresentation(_))
       .WillOnce(Return(mock_representation.get()));
+  EXPECT_CALL(*mock_mpd_builder, ToString(_)).WillOnce(Return(true));
 
   uint32_t container_id;
   SetMpdBuilder(&notifier, mock_mpd_builder.PassAs<MpdBuilder>());
@@ -214,8 +215,7 @@ TEST_F(SimpleMpdNotifierTest, LiveNotifyNewSegment) {
 }
 
 // Verify AddContentProtectionElement() works. Profile doesn't matter.
-// TODO(rkuroiwa): Not implemented yet, enable once it is implemented.
-TEST_F(SimpleMpdNotifierTest, DISABLED_AddContentProtectionElement) {
+TEST_F(SimpleMpdNotifierTest, AddContentProtectionElement) {
   SimpleMpdNotifier notifier(kOnDemandProfile, empty_mpd_option_,
                              empty_base_urls_, output_path_);
 
@@ -228,7 +228,9 @@ TEST_F(SimpleMpdNotifierTest, DISABLED_AddContentProtectionElement) {
       .WillOnce(Return(default_mock_adaptation_set_.get()));
   EXPECT_CALL(*default_mock_adaptation_set_, AddRepresentation(_))
       .WillOnce(Return(mock_representation.get()));
-  EXPECT_CALL(*mock_mpd_builder, ToString(_)).WillOnce(Return(true));
+  EXPECT_CALL(*mock_mpd_builder, ToString(_))
+      .Times(2)
+      .WillRepeatedly(Return(true));
 
   uint32_t container_id;
   SetMpdBuilder(&notifier, mock_mpd_builder.PassAs<MpdBuilder>());