diff --git a/app/packager_main.cc b/app/packager_main.cc
index b13603f9a8..14b8575379 100644
--- a/app/packager_main.cc
+++ b/app/packager_main.cc
@@ -15,7 +15,6 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "media/base/demuxer.h"
-#include "media/base/fixed_encryptor_source.h"
 #include "media/base/media_stream.h"
 #include "media/base/muxer_options.h"
 #include "media/base/request_signer.h"
@@ -76,27 +75,11 @@ scoped_ptr<EncryptorSource> CreateEncryptorSource() {
       }
     }
 
-    WidevineEncryptorSource::TrackType track_type =
-        WidevineEncryptorSource::GetTrackTypeFromString(FLAGS_track_type);
-    if (track_type == WidevineEncryptorSource::TRACK_TYPE_UNKNOWN) {
-      LOG(ERROR) << "Unknown track_type specified.";
-      return scoped_ptr<EncryptorSource>();
-    }
-
     encryptor_source.reset(new WidevineEncryptorSource(
-        FLAGS_server_url, FLAGS_content_id, track_type, signer.Pass()));
+        FLAGS_server_url, FLAGS_content_id, signer.Pass()));
   } else if (FLAGS_enable_fixed_key_encryption) {
-    encryptor_source.reset(
-        new FixedEncryptorSource(FLAGS_key_id, FLAGS_key, FLAGS_pssh));
-  }
-
-  if (encryptor_source) {
-    Status status = encryptor_source->Initialize();
-    if (!status.ok()) {
-      LOG(ERROR) << "Encryptor source failed to initialize: "
-                 << status.ToString();
-      return scoped_ptr<EncryptorSource>();
-    }
+    encryptor_source = EncryptorSource::CreateFromHexStrings(
+        FLAGS_key_id, FLAGS_key, FLAGS_pssh, "");
   }
   return encryptor_source.Pass();
 }
@@ -229,7 +212,15 @@ bool RunPackager(const std::string& input) {
     if (!encryptor_source)
       return false;
   }
-  muxer->SetEncryptorSource(encryptor_source.get(), FLAGS_clear_lead);
+  EncryptorSource::TrackType track_type =
+      EncryptorSource::GetTrackTypeFromString(FLAGS_track_type);
+  if (track_type != EncryptorSource::TRACK_TYPE_SD &&
+      track_type != EncryptorSource::TRACK_TYPE_HD) {
+    LOG(ERROR) << "FLAGS_track_type should be either 'SD' or 'HD'";
+    return false;
+  }
+  muxer->SetEncryptorSource(
+      encryptor_source.get(), track_type, FLAGS_clear_lead);
 
   // Start remuxing process.
   status = demuxer.Run();
diff --git a/app/widevine_encryption_flags.h b/app/widevine_encryption_flags.h
index 3f0b561e97..8590b680f1 100644
--- a/app/widevine_encryption_flags.h
+++ b/app/widevine_encryption_flags.h
@@ -20,7 +20,7 @@ DEFINE_bool(enable_widevine_encryption,
             "--aes_signing_iv) or RSA signing key (--rsa_signing_key_path).");
 DEFINE_string(server_url, "", "License server url.");
 DEFINE_string(content_id, "", "Content Id.");
-DEFINE_string(track_type, "SD", "Track type: HD, SD or AUDIO.");
+DEFINE_string(track_type, "SD", "Track type: SD or HD.");
 DEFINE_string(signer, "", "The name of the signer.");
 DEFINE_string(aes_signing_key,
               "",
diff --git a/media/base/muxer.cc b/media/base/muxer.cc
index d7cc3aa4f8..7825345635 100644
--- a/media/base/muxer.cc
+++ b/media/base/muxer.cc
@@ -16,6 +16,7 @@ Muxer::Muxer(const MuxerOptions& options)
     : options_(options),
       encryptor_source_(NULL),
       initialized_(false),
+      track_type_(EncryptorSource::TRACK_TYPE_SD),
       clear_lead_in_seconds_(0),
       muxer_listener_(NULL),
       clock_(NULL) {}
@@ -23,8 +24,10 @@ Muxer::Muxer(const MuxerOptions& options)
 Muxer::~Muxer() {}
 
 void Muxer::SetEncryptorSource(EncryptorSource* encryptor_source,
+                               EncryptorSource::TrackType track_type,
                                double clear_lead_in_seconds) {
   encryptor_source_ = encryptor_source;
+  track_type_ = track_type;
   clear_lead_in_seconds_ = clear_lead_in_seconds;
 }
 
diff --git a/media/base/muxer.h b/media/base/muxer.h
index 3d52bb80ad..5d3a55970b 100644
--- a/media/base/muxer.h
+++ b/media/base/muxer.h
@@ -13,6 +13,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "media/base/encryptor_source.h"
 #include "media/base/muxer_options.h"
 #include "media/base/status.h"
 
@@ -41,8 +42,11 @@ class Muxer {
   /// Set encryptor source.
   /// @param encryptor_source points to the encryptor source to be injected.
   ///        Should not be NULL.
+  /// @param track_type should be either SD or HD. It affects whether SD key or
+  ///        HD key is used to encrypt the video content.
   /// @param clear_lead_in_seconds specifies clear lead duration in seconds.
   void SetEncryptorSource(EncryptorSource* encryptor_source,
+                          EncryptorSource::TrackType track_type,
                           double clear_lead_in_seconds);
 
   /// Add video/audio stream.
@@ -70,6 +74,7 @@ class Muxer {
  protected:
   const MuxerOptions& options() const { return options_; }
   EncryptorSource* encryptor_source() { return encryptor_source_; }
+  EncryptorSource::TrackType track_type() const { return track_type_; }
   double clear_lead_in_seconds() const { return clear_lead_in_seconds_; }
   event::MuxerListener* muxer_listener() { return muxer_listener_; }
   base::Clock* clock() { return clock_; }
@@ -95,6 +100,7 @@ class Muxer {
   std::vector<MediaStream*> streams_;
   EncryptorSource* encryptor_source_;
   bool initialized_;
+  EncryptorSource::TrackType track_type_;
   double clear_lead_in_seconds_;
 
   event::MuxerListener* muxer_listener_;
diff --git a/media/formats/mp4/box_definitions.cc b/media/formats/mp4/box_definitions.cc
index 706ff1eeb9..800d87b2f0 100644
--- a/media/formats/mp4/box_definitions.cc
+++ b/media/formats/mp4/box_definitions.cc
@@ -90,6 +90,12 @@ ProtectionSystemSpecificHeader::~ProtectionSystemSpecificHeader() {}
 FourCC ProtectionSystemSpecificHeader::BoxType() const { return FOURCC_PSSH; }
 
 bool ProtectionSystemSpecificHeader::ReadWrite(BoxBuffer* buffer) {
+  if (!buffer->Reading() && !raw_box.empty()) {
+    // Write the raw box directly.
+    buffer->writer()->AppendVector(raw_box);
+    return true;
+  }
+
   uint32 size = data.size();
   RCHECK(FullBox::ReadWrite(buffer) &&
          buffer->ReadWriteVector(&system_id, 16) &&
@@ -108,7 +114,10 @@ bool ProtectionSystemSpecificHeader::ReadWrite(BoxBuffer* buffer) {
 }
 
 uint32 ProtectionSystemSpecificHeader::ComputeSize() {
-  atom_size = kFullBoxSize + system_id.size() + sizeof(uint32) + data.size();
+  if (!raw_box.empty())
+    atom_size = raw_box.size();
+  else
+    atom_size = kFullBoxSize + system_id.size() + sizeof(uint32) + data.size();
   return atom_size;
 }
 
diff --git a/media/formats/mp4/box_definitions_unittest.cc b/media/formats/mp4/box_definitions_unittest.cc
index ac3de91a3a..7d30b2c8c8 100644
--- a/media/formats/mp4/box_definitions_unittest.cc
+++ b/media/formats/mp4/box_definitions_unittest.cc
@@ -733,7 +733,7 @@ class BoxDefinitionsTestGeneral : public testing::Test {
 typedef testing::Types<
     FileType,
     SegmentType,
-    // ProtectionSystemSpecificHeader,  // Not fully parsed.
+    ProtectionSystemSpecificHeader,
     SampleAuxiliaryInformationOffset,
     SampleAuxiliaryInformationSize,
     OriginalFormat,
@@ -854,8 +854,17 @@ TEST_F(BoxDefinitionsTest, ProtectionSystemSpecificHeader) {
 
   ProtectionSystemSpecificHeader pssh_readback;
   ASSERT_TRUE(ReadBack(&pssh_readback));
-  // PSSH does not parse data.
-  ASSERT_EQ(pssh.system_id, pssh_readback.system_id);
+  ASSERT_EQ(pssh, pssh_readback);
+
+  pssh_readback.raw_box[15] += 1;
+  pssh_readback.Write(this->buffer_.get());
+
+  ProtectionSystemSpecificHeader pssh_readback2;
+  ASSERT_TRUE(ReadBack(&pssh_readback2));
+
+  // If raw_box is set, raw_box will be written instead.
+  ASSERT_FALSE(pssh_readback == pssh_readback2);
+  ASSERT_EQ(pssh_readback.raw_box, pssh_readback2.raw_box);
 }
 
 TEST_F(BoxDefinitionsTest, CompactSampleSize_FieldSize16) {
diff --git a/media/formats/mp4/mp4_muxer.cc b/media/formats/mp4/mp4_muxer.cc
index 3aa23d83c3..ba9ad7c498 100644
--- a/media/formats/mp4/mp4_muxer.cc
+++ b/media/formats/mp4/mp4_muxer.cc
@@ -23,9 +23,6 @@
 #include "media/formats/mp4/single_segment_segmenter.h"
 
 namespace {
-// The version of cenc implemented here. CENC 4.
-const int kCencSchemeVersion = 0x00010000;
-
 // Sets the range start and end value from offset and size.
 // |start| and |end| are for byte-range-spec specified in RFC2616.
 void SetStartAndEndFromOffsetAndSize(size_t offset,
@@ -93,11 +90,6 @@ Status MP4Muxer::Initialize() {
     }
   }
 
-  if (IsEncryptionRequired()) {
-    moov->pssh.resize(1);
-    GeneratePssh(&moov->pssh[0]);
-  }
-
   if (options().single_segment) {
     segmenter_.reset(
         new SingleSegmentSegmenter(options(), ftyp.Pass(), moov.Pass()));
@@ -107,7 +99,7 @@ Status MP4Muxer::Initialize() {
   }
 
   Status segmenter_initialized = segmenter_->Initialize(
-      encryptor_source(), clear_lead_in_seconds(), streams());
+      streams(), encryptor_source(), track_type(), clear_lead_in_seconds());
 
   if (!segmenter_initialized.ok())
     return segmenter_initialized;
@@ -169,17 +161,6 @@ void MP4Muxer::GenerateVideoTrak(const VideoStreamInfo* video_info,
       trak->media.information.sample_table.description;
   sample_description.type = kVideo;
   sample_description.video_entries.push_back(video);
-
-  if (IsEncryptionRequired()) {
-    DCHECK(encryptor_source());
-    // Add a second entry for clear content if needed.
-    if (clear_lead_in_seconds() > 0)
-      sample_description.video_entries.push_back(video);
-
-    VideoSampleEntry& encrypted_video = sample_description.video_entries[0];
-    GenerateSinf(&encrypted_video.sinf, encrypted_video.format);
-    encrypted_video.format = FOURCC_ENCV;
-  }
 }
 
 void MP4Muxer::GenerateAudioTrak(const AudioStreamInfo* audio_info,
@@ -209,33 +190,6 @@ void MP4Muxer::GenerateAudioTrak(const AudioStreamInfo* audio_info,
       trak->media.information.sample_table.description;
   sample_description.type = kAudio;
   sample_description.audio_entries.push_back(audio);
-
-  if (IsEncryptionRequired()) {
-    DCHECK(encryptor_source());
-    // Add a second entry for clear content if needed.
-    if (clear_lead_in_seconds() > 0)
-      sample_description.audio_entries.push_back(audio);
-
-    AudioSampleEntry& encrypted_audio = sample_description.audio_entries[0];
-    GenerateSinf(&encrypted_audio.sinf, encrypted_audio.format);
-    encrypted_audio.format = FOURCC_ENCA;
-  }
-}
-
-void MP4Muxer::GeneratePssh(ProtectionSystemSpecificHeader* pssh) {
-  DCHECK(encryptor_source());
-  pssh->system_id = encryptor_source()->key_system_id();
-  pssh->data = encryptor_source()->pssh();
-}
-
-void MP4Muxer::GenerateSinf(ProtectionSchemeInfo* sinf, FourCC old_type) {
-  DCHECK(encryptor_source());
-  sinf->format.format = old_type;
-  sinf->type.type = FOURCC_CENC;
-  sinf->type.version = kCencSchemeVersion;
-  sinf->info.track_encryption.is_encrypted = true;
-  sinf->info.track_encryption.default_iv_size = encryptor_source()->iv_size();
-  sinf->info.track_encryption.default_kid = encryptor_source()->key_id();
 }
 
 void MP4Muxer::GetStreamInfo(std::vector<StreamInfo*>* stream_infos) {
@@ -320,7 +274,7 @@ void MP4Muxer::FireOnMediaEndEvent() {
                                index_range_end,
                                duration_seconds,
                                file_size,
-                               IsEncryptionRequired());
+                               encryptor_source());
 }
 
 uint64 MP4Muxer::IsoTimeNow() {
diff --git a/media/formats/mp4/mp4_muxer.h b/media/formats/mp4/mp4_muxer.h
index 840e122ecf..9c01c82539 100644
--- a/media/formats/mp4/mp4_muxer.h
+++ b/media/formats/mp4/mp4_muxer.h
@@ -50,15 +50,6 @@ class MP4Muxer : public Muxer {
                          Track* trak,
                          uint32 track_id);
 
-  // Generate Pssh atom.
-  void GeneratePssh(ProtectionSystemSpecificHeader* pssh);
-
-  // Generates a sinf atom with CENC encryption parameters.
-  void GenerateSinf(ProtectionSchemeInfo* sinf, FourCC old_type);
-
-  // Should we enable encrytion?
-  bool IsEncryptionRequired() { return (encryptor_source() != NULL); }
-
   // Helper functions for events.
   void GetStreamInfo(std::vector<StreamInfo*>* stream_infos);
 
diff --git a/media/formats/mp4/multi_segment_segmenter.cc b/media/formats/mp4/multi_segment_segmenter.cc
index 27c75c6b22..7547fa5a02 100644
--- a/media/formats/mp4/multi_segment_segmenter.cc
+++ b/media/formats/mp4/multi_segment_segmenter.cc
@@ -30,34 +30,6 @@ MultiSegmentSegmenter::MultiSegmentSegmenter(const MuxerOptions& options,
 
 MultiSegmentSegmenter::~MultiSegmentSegmenter() {}
 
-Status MultiSegmentSegmenter::Initialize(
-    EncryptorSource* encryptor_source,
-    double clear_lead_in_seconds,
-    const std::vector<MediaStream*>& streams) {
-  Status status =
-      Segmenter::Initialize(encryptor_source, clear_lead_in_seconds, streams);
-  if (!status.ok())
-    return status;
-
-  DCHECK(ftyp());
-  DCHECK(moov());
-  // Generate the output file with init segment.
-  File* file = File::Open(options().output_file_name.c_str(), "w");
-  if (file == NULL) {
-    return Status(error::FILE_FAILURE,
-                  "Cannot open file for write " + options().output_file_name);
-  }
-  scoped_ptr<BufferWriter> buffer(new BufferWriter);
-  ftyp()->Write(buffer.get());
-  moov()->Write(buffer.get());
-  status = buffer->WriteToFile(file);
-  if (!file->Close()) {
-    LOG(WARNING) << "Failed to close the file properly: "
-                 << options().output_file_name;
-  }
-  return status;
-}
-
 bool MultiSegmentSegmenter::GetInitRange(size_t* offset, size_t* size) {
   DLOG(INFO) << "MultiSegmentSegmenter outputs init segment: "
              << options().output_file_name;
@@ -69,11 +41,31 @@ bool MultiSegmentSegmenter::GetIndexRange(size_t* offset, size_t* size) {
   return false;
 }
 
-Status MultiSegmentSegmenter::FinalizeSegment() {
-  Status status = Segmenter::FinalizeSegment();
-  if (!status.ok())
-    return status;
+Status MultiSegmentSegmenter::DoInitialize() {
+  DCHECK(ftyp());
+  DCHECK(moov());
+  // Generate the output file with init segment.
+  File* file = File::Open(options().output_file_name.c_str(), "w");
+  if (file == NULL) {
+    return Status(error::FILE_FAILURE,
+                  "Cannot open file for write " + options().output_file_name);
+  }
+  scoped_ptr<BufferWriter> buffer(new BufferWriter);
+  ftyp()->Write(buffer.get());
+  moov()->Write(buffer.get());
+  Status status = buffer->WriteToFile(file);
+  if (!file->Close()) {
+    LOG(WARNING) << "Failed to close the file properly: "
+                 << options().output_file_name;
+  }
+  return status;
+}
 
+Status MultiSegmentSegmenter::DoFinalize() {
+  return Status::OK;
+}
+
+Status MultiSegmentSegmenter::DoFinalizeSegment() {
   DCHECK(sidx());
   // earliest_presentation_time is the earliest presentation time of any
   // access unit in the reference stream in the first subsegment.
diff --git a/media/formats/mp4/multi_segment_segmenter.h b/media/formats/mp4/multi_segment_segmenter.h
index 36fd4a994a..adb581a435 100644
--- a/media/formats/mp4/multi_segment_segmenter.h
+++ b/media/formats/mp4/multi_segment_segmenter.h
@@ -36,18 +36,16 @@ class MultiSegmentSegmenter : public Segmenter {
 
   /// @name Segmenter implementation overrides.
   /// @{
-  virtual Status Initialize(EncryptorSource* encryptor_source,
-                            double clear_lead_in_seconds,
-                            const std::vector<MediaStream*>& streams) OVERRIDE;
-
   virtual bool GetInitRange(size_t* offset, size_t* size) OVERRIDE;
   virtual bool GetIndexRange(size_t* offset, size_t* size) OVERRIDE;
   /// @}
 
- protected:
-  virtual Status FinalizeSegment() OVERRIDE;
-
  private:
+  // Segmenter implementation overrides.
+  virtual Status DoInitialize() OVERRIDE;
+  virtual Status DoFinalize() OVERRIDE;
+  virtual Status DoFinalizeSegment() OVERRIDE;
+
   // Write segment to file.
   Status WriteSegment();
 
diff --git a/media/formats/mp4/segmenter.cc b/media/formats/mp4/segmenter.cc
index ae56efdbf8..63a648568f 100644
--- a/media/formats/mp4/segmenter.cc
+++ b/media/formats/mp4/segmenter.cc
@@ -9,6 +9,7 @@
 #include <algorithm>
 
 #include "base/stl_util.h"
+#include "media/base/aes_encryptor.h"
 #include "media/base/buffer_writer.h"
 #include "media/base/encryptor_source.h"
 #include "media/base/media_sample.h"
@@ -18,14 +19,79 @@
 #include "media/formats/mp4/box_definitions.h"
 #include "media/formats/mp4/fragmenter.h"
 
+namespace media {
+namespace mp4 {
+
 namespace {
+
+// Generate 64bit IV by default.
+const size_t kDefaultIvSize = 8u;
+
+// The version of cenc implemented here. CENC 4.
+const int kCencSchemeVersion = 0x00010000;
+
 uint64 Rescale(uint64 time_in_old_scale, uint32 old_scale, uint32 new_scale) {
   return static_cast<double>(time_in_old_scale) / old_scale * new_scale;
 }
-}  // namespace
 
-namespace media {
-namespace mp4 {
+scoped_ptr<AesCtrEncryptor> CreateEncryptor(
+    const EncryptionKey& encryption_key) {
+  scoped_ptr<AesCtrEncryptor> encryptor(new AesCtrEncryptor());
+  const bool initialized =
+      encryption_key.iv.empty()
+          ? encryptor->InitializeWithRandomIv(encryption_key.key,
+                                              kDefaultIvSize)
+          : encryptor->InitializeWithIv(encryption_key.key, encryption_key.iv);
+  if (!initialized) {
+    LOG(ERROR) << "Failed to the initialize encryptor.";
+    return scoped_ptr<AesCtrEncryptor>();
+  }
+  return encryptor.Pass();
+}
+
+void GenerateSinf(const EncryptionKey& encryption_key,
+                  FourCC old_type,
+                  ProtectionSchemeInfo* sinf) {
+  sinf->format.format = old_type;
+  sinf->type.type = FOURCC_CENC;
+  sinf->type.version = kCencSchemeVersion;
+  sinf->info.track_encryption.is_encrypted = true;
+  sinf->info.track_encryption.default_iv_size =
+      encryption_key.iv.empty() ? kDefaultIvSize : encryption_key.iv.size();
+  sinf->info.track_encryption.default_kid = encryption_key.key_id;
+}
+
+void GenerateEncryptedSampleEntry(const EncryptionKey& encryption_key,
+                                  double clear_lead_in_seconds,
+                                  SampleDescription* description) {
+  DCHECK(description);
+  if (description->type == kVideo) {
+    DCHECK_EQ(1u, description->video_entries.size());
+
+    // Add a second entry for clear content if needed.
+    if (clear_lead_in_seconds > 0)
+      description->video_entries.push_back(description->video_entries[0]);
+
+    // Convert the first entry to an encrypted entry.
+    VideoSampleEntry& entry = description->video_entries[0];
+    GenerateSinf(encryption_key, entry.format, &entry.sinf);
+    entry.format = FOURCC_ENCV;
+  } else {
+    DCHECK_EQ(kAudio, description->type);
+    DCHECK_EQ(1u, description->audio_entries.size());
+
+    // Add a second entry for clear content if needed.
+    if (clear_lead_in_seconds > 0)
+      description->audio_entries.push_back(description->audio_entries[0]);
+
+    // Convert the first entry to an encrypted entry.
+    AudioSampleEntry& entry = description->audio_entries[0];
+    GenerateSinf(encryption_key, entry.format, &entry.sinf);
+    entry.format = FOURCC_ENCA;
+  }
+}
+
+}  // namespace
 
 Segmenter::Segmenter(const MuxerOptions& options,
                      scoped_ptr<FileType> ftyp,
@@ -41,9 +107,10 @@ Segmenter::Segmenter(const MuxerOptions& options,
 
 Segmenter::~Segmenter() { STLDeleteElements(&fragmenters_); }
 
-Status Segmenter::Initialize(EncryptorSource* encryptor_source,
-                             double clear_lead_in_seconds,
-                             const std::vector<MediaStream*>& streams) {
+Status Segmenter::Initialize(const std::vector<MediaStream*>& streams,
+                             EncryptorSource* encryptor_source,
+                             EncryptorSource::TrackType track_type,
+                             double clear_lead_in_seconds) {
   DCHECK_LT(0u, streams.size());
   moof_->header.sequence_number = 0;
 
@@ -64,7 +131,30 @@ Status Segmenter::Initialize(EncryptorSource* encryptor_source,
     }
     scoped_ptr<AesCtrEncryptor> encryptor;
     if (encryptor_source) {
-      encryptor = encryptor_source->CreateEncryptor();
+      SampleDescription& description =
+          moov_->tracks[i].media.information.sample_table.description;
+
+      DCHECK(track_type == EncryptorSource::TRACK_TYPE_SD ||
+             track_type == EncryptorSource::TRACK_TYPE_HD);
+
+      EncryptionKey encryption_key;
+      Status status = encryptor_source->GetKey(
+          description.type == kAudio ? EncryptorSource::TRACK_TYPE_AUDIO
+                                     : track_type,
+          &encryption_key);
+      if (!status.ok())
+        return status;
+
+      GenerateEncryptedSampleEntry(
+          encryption_key, clear_lead_in_seconds, &description);
+
+      // We need one and only one pssh box.
+      if (moov_->pssh.empty()) {
+        moov_->pssh.resize(1);
+        moov_->pssh[0].raw_box = encryption_key.pssh;
+      }
+
+      encryptor = CreateEncryptor(encryption_key);
       if (!encryptor)
         return Status(error::MUXER_FAILURE, "Failed to create the encryptor.");
     }
@@ -84,7 +174,7 @@ Status Segmenter::Initialize(EncryptorSource* encryptor_source,
   // Use the reference stream's time scale as movie time scale.
   moov_->header.timescale = sidx_->timescale;
   InitializeFragments();
-  return Status::OK;
+  return DoInitialize();
 }
 
 Status Segmenter::Finalize() {
@@ -110,7 +200,7 @@ Status Segmenter::Finalize() {
       moov_->header.duration = track->header.duration;
   }
 
-  return Status::OK;
+  return DoFinalize();
 }
 
 Status Segmenter::AddSample(const MediaStream* stream,
@@ -191,7 +281,7 @@ void Segmenter::InitializeSegment() {
 
 Status Segmenter::FinalizeSegment() {
   segment_initialized_ = false;
-  return Status::OK;
+  return DoFinalizeSegment();
 }
 
 uint32 Segmenter::GetReferenceStreamId() {
diff --git a/media/formats/mp4/segmenter.h b/media/formats/mp4/segmenter.h
index db4625e749..ffd1ac9341 100644
--- a/media/formats/mp4/segmenter.h
+++ b/media/formats/mp4/segmenter.h
@@ -12,6 +12,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "media/base/encryptor_source.h"
 #include "media/base/status.h"
 
 namespace media {
@@ -47,17 +48,30 @@ class Segmenter {
 
   /// Initialize the segmenter.
   /// Calling other public methods of this class without this method returning
-  /// Status::OK, results in an undefined behavior.
-  /// @param encryptor_source can be NULL.
-  /// @return Status::OK on success.
-  virtual Status Initialize(EncryptorSource* encryptor_source,
-                            double clear_lead_in_seconds,
-                            const std::vector<MediaStream*>& streams);
+  /// Status::OK results in an undefined behavior.
+  /// @param encryptor_source points to the key source which contains
+  ///        the encryption keys. It can be NULL to indicate that no encryption
+  ///        is required.
+  /// @param track_type indicates whether SD key or HD key should be used to
+  ///        encrypt the video content.
+  /// @param clear_time specifies clear lead duration in seconds.
+  /// @return OK on success, an error status otherwise.
+  Status Initialize(const std::vector<MediaStream*>& streams,
+                    EncryptorSource* encryptor_source,
+                    EncryptorSource::TrackType track_type,
+                    double clear_lead_in_seconds);
 
-  virtual Status Finalize();
+  /// Finalize the segmenter.
+  /// @return OK on success, an error status otherwise.
+  Status Finalize();
 
-  virtual Status AddSample(const MediaStream* stream,
-                           scoped_refptr<MediaSample> sample);
+  /// Add sample to the indicated stream.
+  /// @param stream points to the stream to which the sample belongs. It cannot
+  ///        be NULL.
+  /// @param sample points to the sample to be added.
+  /// @return OK on success, an error status otherwise.
+  Status AddSample(const MediaStream* stream,
+                   scoped_refptr<MediaSample> sample);
 
   /// @return true if there is an initialization range, while setting @a offset
   ///         and @a size; or false if initialization range does not apply.
@@ -73,11 +87,6 @@ class Segmenter {
   double GetDuration() const;
 
  protected:
-  void InitializeSegment();
-  virtual Status FinalizeSegment();
-
-  uint32 GetReferenceStreamId();
-
   const MuxerOptions& options() const { return options_; }
   FileType* ftyp() { return ftyp_.get(); }
   Movie* moov() { return moov_.get(); }
@@ -85,6 +94,14 @@ class Segmenter {
   SegmentIndex* sidx() { return sidx_.get(); }
 
  private:
+  virtual Status DoInitialize() = 0;
+  virtual Status DoFinalize() = 0;
+  virtual Status DoFinalizeSegment() = 0;
+
+  void InitializeSegment();
+  Status FinalizeSegment();
+  uint32 GetReferenceStreamId();
+
   void InitializeFragments();
   Status FinalizeFragment(Fragmenter* fragment);
 
diff --git a/media/formats/mp4/single_segment_segmenter.cc b/media/formats/mp4/single_segment_segmenter.cc
index 5480fc76b9..816775c2a0 100644
--- a/media/formats/mp4/single_segment_segmenter.cc
+++ b/media/formats/mp4/single_segment_segmenter.cc
@@ -21,27 +21,30 @@ SingleSegmentSegmenter::SingleSegmentSegmenter(const MuxerOptions& options,
     : Segmenter(options, ftyp.Pass(), moov.Pass()) {}
 SingleSegmentSegmenter::~SingleSegmentSegmenter() {}
 
-Status SingleSegmentSegmenter::Initialize(
-    EncryptorSource* encryptor_source,
-    double clear_lead_in_seconds,
-    const std::vector<MediaStream*>& streams) {
-  Status status =
-      Segmenter::Initialize(encryptor_source, clear_lead_in_seconds, streams);
-  if (!status.ok())
-    return status;
-  temp_file_.reset(File::Open(options().temp_file_name.c_str(), "w"));
-  if (temp_file_ == NULL) {
-    return Status(error::FILE_FAILURE,
-                  "Cannot open file to write " + options().temp_file_name);
-  }
-  return Status::OK;
+bool SingleSegmentSegmenter::GetInitRange(size_t* offset, size_t* size) {
+  // In Finalize, ftyp and moov gets written first so offset must be 0.
+  *offset = 0;
+  *size = ftyp()->ComputeSize() + moov()->ComputeSize();
+  return true;
 }
 
-Status SingleSegmentSegmenter::Finalize() {
-  Status status = Segmenter::Finalize();
-  if (!status.ok())
-    return status;
+bool SingleSegmentSegmenter::GetIndexRange(size_t* offset, size_t* size) {
+  // Index range is right after init range so the offset must be the size of
+  // ftyp and moov.
+  *offset = ftyp()->ComputeSize() + moov()->ComputeSize();
+  *size = vod_sidx_->ComputeSize();
+  return true;
+}
 
+Status SingleSegmentSegmenter::DoInitialize() {
+  temp_file_.reset(File::Open(options().temp_file_name.c_str(), "w"));
+  return temp_file_
+             ? Status::OK
+             : Status(error::FILE_FAILURE,
+                      "Cannot open file to write " + options().temp_file_name);
+}
+
+Status SingleSegmentSegmenter::DoFinalize() {
   DCHECK(temp_file_);
   DCHECK(ftyp());
   DCHECK(moov());
@@ -65,7 +68,7 @@ Status SingleSegmentSegmenter::Finalize() {
   ftyp()->Write(buffer.get());
   moov()->Write(buffer.get());
   vod_sidx_->Write(buffer.get());
-  status = buffer->WriteToFile(file.get());
+  Status status = buffer->WriteToFile(file.get());
   if (!status.ok())
     return status;
 
@@ -94,26 +97,7 @@ Status SingleSegmentSegmenter::Finalize() {
   return Status::OK;
 }
 
-bool SingleSegmentSegmenter::GetInitRange(size_t* offset, size_t* size) {
-  // In Finalize, ftyp and moov gets written first so offset must be 0.
-  *offset = 0;
-  *size = ftyp()->ComputeSize() + moov()->ComputeSize();
-  return true;
-}
-
-bool SingleSegmentSegmenter::GetIndexRange(size_t* offset, size_t* size) {
-  // Index range is right after init range so the offset must be the size of
-  // ftyp and moov.
-  *offset = ftyp()->ComputeSize() + moov()->ComputeSize();
-  *size = vod_sidx_->ComputeSize();
-  return true;
-}
-
-Status SingleSegmentSegmenter::FinalizeSegment() {
-  Status status = Segmenter::FinalizeSegment();
-  if (!status.ok())
-    return status;
-
+Status SingleSegmentSegmenter::DoFinalizeSegment() {
   DCHECK(sidx());
   DCHECK(fragment_buffer());
   // sidx() contains pre-generated segment references with one reference per
diff --git a/media/formats/mp4/single_segment_segmenter.h b/media/formats/mp4/single_segment_segmenter.h
index 51153f2399..2c7f655c4b 100644
--- a/media/formats/mp4/single_segment_segmenter.h
+++ b/media/formats/mp4/single_segment_segmenter.h
@@ -33,19 +33,16 @@ class SingleSegmentSegmenter : public Segmenter {
 
   /// @name Segmenter implementation overrides.
   /// @{
-  virtual Status Initialize(EncryptorSource* encryptor_source,
-                            double clear_lead_in_seconds,
-                            const std::vector<MediaStream*>& streams) OVERRIDE;
-  virtual Status Finalize() OVERRIDE;
-
   virtual bool GetInitRange(size_t* offset, size_t* size) OVERRIDE;
   virtual bool GetIndexRange(size_t* offset, size_t* size) OVERRIDE;
   /// @}
 
- protected:
-  virtual Status FinalizeSegment() OVERRIDE;
-
  private:
+  // Segmenter implementation overrides.
+  virtual Status DoInitialize() OVERRIDE;
+  virtual Status DoFinalize() OVERRIDE;
+  virtual Status DoFinalizeSegment() OVERRIDE;
+
   scoped_ptr<SegmentIndex> vod_sidx_;
   scoped_ptr<File, FileCloser> temp_file_;
 
diff --git a/media/test/packager_test.cc b/media/test/packager_test.cc
index 3859c9419a..dc5bf9daa7 100644
--- a/media/test/packager_test.cc
+++ b/media/test/packager_test.cc
@@ -9,7 +9,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/time/clock.h"
 #include "media/base/demuxer.h"
-#include "media/base/fixed_encryptor_source.h"
+#include "media/base/encryptor_source.h"
 #include "media/base/media_stream.h"
 #include "media/base/muxer.h"
 #include "media/base/status_test_util.h"
@@ -148,8 +148,9 @@ void PackagerTestBasic::Remux(const std::string& input,
   Demuxer demuxer(GetFullPath(input), decryptor_source_);
   ASSERT_OK(demuxer.Initialize());
 
-  FixedEncryptorSource encryptor_source(kKeyIdHex, kKeyHex, kPsshHex);
-  ASSERT_OK(encryptor_source.Initialize());
+  scoped_ptr<EncryptorSource> encryptor_source(
+      EncryptorSource::CreateFromHexStrings(kKeyIdHex, kKeyHex, kPsshHex, ""));
+  DCHECK(encryptor_source);
 
   scoped_ptr<Muxer> muxer_video;
   if (!video_output.empty()) {
@@ -159,8 +160,11 @@ void PackagerTestBasic::Remux(const std::string& input,
 
     muxer_video->AddStream(FindFirstVideoStream(demuxer.streams()));
 
-    if (enable_encryption)
-      muxer_video->SetEncryptorSource(&encryptor_source, kClearLeadInSeconds);
+    if (enable_encryption) {
+      muxer_video->SetEncryptorSource(encryptor_source.get(),
+                                      EncryptorSource::TRACK_TYPE_SD,
+                                      kClearLeadInSeconds);
+    }
   }
 
   scoped_ptr<Muxer> muxer_audio;
@@ -171,8 +175,11 @@ void PackagerTestBasic::Remux(const std::string& input,
 
     muxer_audio->AddStream(FindFirstAudioStream(demuxer.streams()));
 
-    if (enable_encryption)
-      muxer_video->SetEncryptorSource(&encryptor_source, kClearLeadInSeconds);
+    if (enable_encryption) {
+      muxer_audio->SetEncryptorSource(encryptor_source.get(),
+                                      EncryptorSource::TRACK_TYPE_SD,
+                                      kClearLeadInSeconds);
+    }
   }
 
   // Start remuxing process.