diff --git a/drm/common/IDrmManagerService.cpp b/drm/common/IDrmManagerService.cpp
index 2d8e877..986f32c 100644
--- a/drm/common/IDrmManagerService.cpp
+++ b/drm/common/IDrmManagerService.cpp
@@ -110,11 +110,11 @@
     handle->extendedData.clear();
 }
 
-int BpDrmManagerService::addUniqueId(int uniqueId) {
+int BpDrmManagerService::addUniqueId(bool isNative) {
     LOGV("add uniqueid");
     Parcel data, reply;
     data.writeInterfaceToken(IDrmManagerService::getInterfaceDescriptor());
-    data.writeInt32(uniqueId);
+    data.writeInt32(isNative);
     remote()->transact(ADD_UNIQUEID, data, &reply);
     return reply.readInt32();
 }
diff --git a/drm/drmserver/DrmManager.cpp b/drm/drmserver/DrmManager.cpp
index 1809619..3e4fe8c 100644
--- a/drm/drmserver/DrmManager.cpp
+++ b/drm/drmserver/DrmManager.cpp
@@ -49,32 +49,42 @@
 
 }
 
-int DrmManager::addUniqueId(int uniqueId) {
+int DrmManager::addUniqueId(bool isNative) {
     Mutex::Autolock _l(mLock);
-    if (0 == uniqueId) {
-        int temp = 0;
-        bool foundUniqueId = false;
-        srand(time(NULL));
 
-        while (!foundUniqueId) {
-            const int size = mUniqueIdVector.size();
-            temp = rand() % 100;
+    int temp = 0;
+    bool foundUniqueId = false;
+    const int size = mUniqueIdVector.size();
+    const int uniqueIdRange = 0xfff;
+    int maxLoopTimes = (uniqueIdRange - 1) / 2;
+    srand(time(NULL));
 
-            int index = 0;
-            for (; index < size; ++index) {
-                if (mUniqueIdVector.itemAt(index) == temp) {
-                    foundUniqueId = false;
-                    break;
-                }
-            }
-            if (index == size) {
-                foundUniqueId = true;
+    while (!foundUniqueId) {
+        temp = rand() & uniqueIdRange;
+
+        if (isNative) {
+            // set a flag to differentiate DrmManagerClient
+            // created from native side and java side
+            temp |= 0x1000;
+        }
+
+        int index = 0;
+        for (; index < size; ++index) {
+            if (mUniqueIdVector.itemAt(index) == temp) {
+                foundUniqueId = false;
+                break;
             }
         }
-        uniqueId = temp;
+        if (index == size) {
+            foundUniqueId = true;
+        }
+
+        maxLoopTimes --;
+        LOG_FATAL_IF(maxLoopTimes <= 0, "cannot find an unique ID for this session");
     }
-    mUniqueIdVector.push(uniqueId);
-    return uniqueId;
+
+    mUniqueIdVector.push(temp);
+    return temp;
 }
 
 void DrmManager::removeUniqueId(int uniqueId) {
diff --git a/drm/drmserver/DrmManagerService.cpp b/drm/drmserver/DrmManagerService.cpp
index 583669e..7ebcac3 100644
--- a/drm/drmserver/DrmManagerService.cpp
+++ b/drm/drmserver/DrmManagerService.cpp
@@ -78,8 +78,8 @@
     delete mDrmManager; mDrmManager = NULL;
 }
 
-int DrmManagerService::addUniqueId(int uniqueId) {
-    return mDrmManager->addUniqueId(uniqueId);
+int DrmManagerService::addUniqueId(bool isNative) {
+    return mDrmManager->addUniqueId(isNative);
 }
 
 void DrmManagerService::removeUniqueId(int uniqueId) {
diff --git a/drm/java/android/drm/DrmManagerClient.java b/drm/java/android/drm/DrmManagerClient.java
index f3a0343..9a7194c 100755
--- a/drm/java/android/drm/DrmManagerClient.java
+++ b/drm/java/android/drm/DrmManagerClient.java
@@ -248,9 +248,7 @@
         mEventHandler = new EventHandler(eventThread.getLooper());
 
         // save the unique id
-        mUniqueId = hashCode();
-
-        _initialize(mUniqueId, new WeakReference<DrmManagerClient>(this));
+        mUniqueId = _initialize(new WeakReference<DrmManagerClient>(this));
     }
 
     protected void finalize() {
@@ -794,7 +792,7 @@
     }
 
     // private native interfaces
-    private native void _initialize(int uniqueId, Object weak_this);
+    private native int _initialize(Object weak_this);
 
     private native void _finalize(int uniqueId);
 
diff --git a/drm/jni/android_drm_DrmManagerClient.cpp b/drm/jni/android_drm_DrmManagerClient.cpp
index e131839..80a8447 100644
--- a/drm/jni/android_drm_DrmManagerClient.cpp
+++ b/drm/jni/android_drm_DrmManagerClient.cpp
@@ -224,11 +224,12 @@
     return sp<DrmManagerClientImpl>(client);
 }
 
-static void android_drm_DrmManagerClient_initialize(
-        JNIEnv* env, jobject thiz, jint uniqueId, jobject weak_thiz) {
+static jint android_drm_DrmManagerClient_initialize(
+        JNIEnv* env, jobject thiz, jobject weak_thiz) {
     LOGV("initialize - Enter");
 
-    sp<DrmManagerClientImpl> drmManager = DrmManagerClientImpl::create(&uniqueId);
+    int uniqueId = 0;
+    sp<DrmManagerClientImpl> drmManager = DrmManagerClientImpl::create(&uniqueId, false);
     drmManager->addClient(uniqueId);
 
     // Set the listener to DrmManager
@@ -237,6 +238,8 @@
 
     setDrmManagerClientImpl(env, thiz, drmManager);
     LOGV("initialize - Exit");
+
+    return uniqueId;
 }
 
 static void android_drm_DrmManagerClient_finalize(JNIEnv* env, jobject thiz, jint uniqueId) {
@@ -711,7 +714,7 @@
 
 static JNINativeMethod nativeMethods[] = {
 
-    {"_initialize", "(ILjava/lang/Object;)V",
+    {"_initialize", "(Ljava/lang/Object;)I",
                                     (void*)android_drm_DrmManagerClient_initialize},
 
     {"_finalize", "(I)V",
diff --git a/drm/libdrmframework/DrmManagerClient.cpp b/drm/libdrmframework/DrmManagerClient.cpp
index b50199f..c9c0d57 100644
--- a/drm/libdrmframework/DrmManagerClient.cpp
+++ b/drm/libdrmframework/DrmManagerClient.cpp
@@ -24,7 +24,7 @@
 
 DrmManagerClient::DrmManagerClient():
         mUniqueId(0), mDrmManagerClientImpl(NULL) {
-    mDrmManagerClientImpl = DrmManagerClientImpl::create(&mUniqueId);
+    mDrmManagerClientImpl = DrmManagerClientImpl::create(&mUniqueId, true);
     mDrmManagerClientImpl->addClient(mUniqueId);
 }
 
diff --git a/drm/libdrmframework/DrmManagerClientImpl.cpp b/drm/libdrmframework/DrmManagerClientImpl.cpp
index a36bd4a..67f58ca 100644
--- a/drm/libdrmframework/DrmManagerClientImpl.cpp
+++ b/drm/libdrmframework/DrmManagerClientImpl.cpp
@@ -33,13 +33,10 @@
 sp<DrmManagerClientImpl::DeathNotifier> DrmManagerClientImpl::sDeathNotifier;
 const String8 DrmManagerClientImpl::EMPTY_STRING("");
 
-DrmManagerClientImpl* DrmManagerClientImpl::create(int* pUniqueId) {
-    if (0 == *pUniqueId) {
-        int uniqueId = getDrmManagerService()->addUniqueId(*pUniqueId);
-        *pUniqueId = uniqueId;
-    } else {
-        getDrmManagerService()->addUniqueId(*pUniqueId);
-    }
+DrmManagerClientImpl* DrmManagerClientImpl::create(
+        int* pUniqueId, bool isNative) {
+    *pUniqueId = getDrmManagerService()->addUniqueId(isNative);
+
     return new DrmManagerClientImpl();
 }
 
diff --git a/drm/libdrmframework/include/DrmManager.h b/drm/libdrmframework/include/DrmManager.h
index af2c2a8..ac2b946 100644
--- a/drm/libdrmframework/include/DrmManager.h
+++ b/drm/libdrmframework/include/DrmManager.h
@@ -53,7 +53,7 @@
     virtual ~DrmManager();
 
 public:
-    int addUniqueId(int uniqueId);
+    int addUniqueId(bool isNative);
 
     void removeUniqueId(int uniqueId);
 
diff --git a/drm/libdrmframework/include/DrmManagerClientImpl.h b/drm/libdrmframework/include/DrmManagerClientImpl.h
index 564896b..e3338d9 100644
--- a/drm/libdrmframework/include/DrmManagerClientImpl.h
+++ b/drm/libdrmframework/include/DrmManagerClientImpl.h
@@ -38,7 +38,7 @@
     DrmManagerClientImpl() { }
 
 public:
-    static DrmManagerClientImpl* create(int* pUniqueId);
+    static DrmManagerClientImpl* create(int* pUniqueId, bool isNative);
 
     static void remove(int uniqueId);
 
diff --git a/drm/libdrmframework/include/DrmManagerService.h b/drm/libdrmframework/include/DrmManagerService.h
index 227496a..9cb5804 100644
--- a/drm/libdrmframework/include/DrmManagerService.h
+++ b/drm/libdrmframework/include/DrmManagerService.h
@@ -46,7 +46,7 @@
     virtual ~DrmManagerService();
 
 public:
-    int addUniqueId(int uniqueId);
+    int addUniqueId(bool isNative);
 
     void removeUniqueId(int uniqueId);
 
diff --git a/drm/libdrmframework/include/IDrmManagerService.h b/drm/libdrmframework/include/IDrmManagerService.h
index 7727e55..b9618bb 100644
--- a/drm/libdrmframework/include/IDrmManagerService.h
+++ b/drm/libdrmframework/include/IDrmManagerService.h
@@ -81,7 +81,7 @@
     DECLARE_META_INTERFACE(DrmManagerService);
 
 public:
-    virtual int addUniqueId(int uniqueId) = 0;
+    virtual int addUniqueId(bool isNative) = 0;
 
     virtual void removeUniqueId(int uniqueId) = 0;
 
@@ -167,7 +167,7 @@
     BpDrmManagerService(const sp<IBinder>& impl)
             : BpInterface<IDrmManagerService>(impl) {}
 
-    virtual int addUniqueId(int uniqueId);
+    virtual int addUniqueId(bool isNative);
 
     virtual void removeUniqueId(int uniqueId);
 
diff --git a/drm/libdrmframework/plugins/common/include/DrmEngineBase.h b/drm/libdrmframework/plugins/common/include/DrmEngineBase.h
index b61e3d3..4a5afcf 100644
--- a/drm/libdrmframework/plugins/common/include/DrmEngineBase.h
+++ b/drm/libdrmframework/plugins/common/include/DrmEngineBase.h
@@ -143,7 +143,13 @@
      * Register a callback to be invoked when the caller required to
      * receive necessary information
      *
-     * @param[in] uniqueId Unique identifier for a session
+     * @param[in] uniqueId Unique identifier for a session. uniqueId is a random
+     *                     number generated in the DRM service. If the DrmManagerClient
+     *                     is created in native code, uniqueId will be a number ranged
+     *                     from 0x1000 to 0x1fff. If it comes from Java code, the uniqueId
+     *                     will be a number ranged from 0x00 to 0xfff. So bit 0x1000 in
+     *                     uniqueId could be used in DRM plugins to differentiate native
+     *                     OnInfoListener and Java OnInfoListener.
      * @param[in] infoListener Listener
      * @return status_t
      *     Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure