diff --git a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ICas.aidl b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ICas.aidl
index 28c9eb0..903ab92 100644
--- a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ICas.aidl
+++ b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ICas.aidl
@@ -36,6 +36,7 @@
 @VintfStability
 interface ICas {
   void closeSession(in byte[] sessionId);
+  byte[] openSessionDefault();
   byte[] openSession(in android.hardware.cas.SessionIntent intent, in android.hardware.cas.ScramblingMode mode);
   void processEcm(in byte[] sessionId, in byte[] ecm);
   void processEmm(in byte[] emm);
diff --git a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ScramblingMode.aidl b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ScramblingMode.aidl
index a0b08c9..9d542cc 100644
--- a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ScramblingMode.aidl
+++ b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/ScramblingMode.aidl
@@ -36,18 +36,18 @@
 @Backing(type="int") @VintfStability
 enum ScramblingMode {
   RESERVED = 0,
-  DVB_CSA1 = 1,
-  DVB_CSA2 = 2,
-  DVB_CSA3_STANDARD = 3,
-  DVB_CSA3_MINIMAL = 4,
-  DVB_CSA3_ENHANCE = 5,
-  DVB_CISSA_V1 = 6,
-  DVB_IDSA = 7,
-  MULTI2 = 8,
-  AES128 = 9,
-  AES_ECB = 10,
-  AES_SCTE52 = 11,
-  TDES_ECB = 12,
-  TDES_SCTE52 = 13,
-  AES_CBC = 14,
+  DVB_CSA1,
+  DVB_CSA2,
+  DVB_CSA3_STANDARD,
+  DVB_CSA3_MINIMAL,
+  DVB_CSA3_ENHANCE,
+  DVB_CISSA_V1,
+  DVB_IDSA,
+  MULTI2,
+  AES128,
+  AES_ECB,
+  AES_SCTE52,
+  TDES_ECB,
+  TDES_SCTE52,
+  AES_CBC,
 }
diff --git a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/SessionIntent.aidl b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/SessionIntent.aidl
index ade3001..00a2fd7 100644
--- a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/SessionIntent.aidl
+++ b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/SessionIntent.aidl
@@ -35,8 +35,8 @@
 /* @hide */
 @Backing(type="int") @VintfStability
 enum SessionIntent {
-  LIVE = 0,
-  PLAYBACK = 1,
-  RECORD = 2,
-  TIMESHIFT = 3,
+  LIVE,
+  PLAYBACK,
+  RECORD,
+  TIMESHIFT,
 }
diff --git a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/Status.aidl b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/Status.aidl
index 343c810..3691009 100644
--- a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/Status.aidl
+++ b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/Status.aidl
@@ -36,25 +36,25 @@
 @VintfStability
 parcelable Status {
   const int OK = 0;
-  const int ERROR_CAS_NO_LICENSE = -1;
-  const int ERROR_CAS_LICENSE_EXPIRED = -2;
-  const int ERROR_CAS_SESSION_NOT_OPENED = -3;
-  const int ERROR_CAS_CANNOT_HANDLE = -4;
-  const int ERROR_CAS_INVALID_STATE = -5;
-  const int BAD_VALUE = -6;
-  const int ERROR_CAS_NOT_PROVISIONED = -7;
-  const int ERROR_CAS_RESOURCE_BUSY = -8;
-  const int ERROR_CAS_INSUFFICIENT_OUTPUT_PROTECTION = -9;
-  const int ERROR_CAS_TAMPER_DETECTED = -10;
-  const int ERROR_CAS_DEVICE_REVOKED = -11;
-  const int ERROR_CAS_DECRYPT_UNIT_NOT_INITIALIZED = -12;
-  const int ERROR_CAS_DECRYPT = -13;
-  const int ERROR_CAS_UNKNOWN = -14;
-  const int ERROR_CAS_NEED_ACTIVATION = -15;
-  const int ERROR_CAS_NEED_PAIRING = -16;
-  const int ERROR_CAS_NO_CARD = -17;
-  const int ERROR_CAS_CARD_MUTE = -18;
-  const int ERROR_CAS_CARD_INVALID = -19;
-  const int ERROR_CAS_BLACKOUT = -20;
-  const int ERROR_CAS_REBOOTING = -21;
+  const int ERROR_CAS_NO_LICENSE = 1;
+  const int ERROR_CAS_LICENSE_EXPIRED = 2;
+  const int ERROR_CAS_SESSION_NOT_OPENED = 3;
+  const int ERROR_CAS_CANNOT_HANDLE = 4;
+  const int ERROR_CAS_INVALID_STATE = 5;
+  const int BAD_VALUE = 6;
+  const int ERROR_CAS_NOT_PROVISIONED = 7;
+  const int ERROR_CAS_RESOURCE_BUSY = 8;
+  const int ERROR_CAS_INSUFFICIENT_OUTPUT_PROTECTION = 9;
+  const int ERROR_CAS_TAMPER_DETECTED = 10;
+  const int ERROR_CAS_DEVICE_REVOKED = 11;
+  const int ERROR_CAS_DECRYPT_UNIT_NOT_INITIALIZED = 12;
+  const int ERROR_CAS_DECRYPT = 13;
+  const int ERROR_CAS_UNKNOWN = 14;
+  const int ERROR_CAS_NEED_ACTIVATION = 15;
+  const int ERROR_CAS_NEED_PAIRING = 16;
+  const int ERROR_CAS_NO_CARD = 17;
+  const int ERROR_CAS_CARD_MUTE = 18;
+  const int ERROR_CAS_CARD_INVALID = 19;
+  const int ERROR_CAS_BLACKOUT = 20;
+  const int ERROR_CAS_REBOOTING = 21;
 }
diff --git a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/StatusEvent.aidl b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/StatusEvent.aidl
index 165c0d4..0cf37dd 100644
--- a/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/StatusEvent.aidl
+++ b/cas/aidl/aidl_api/android.hardware.cas/current/android/hardware/cas/StatusEvent.aidl
@@ -35,6 +35,6 @@
 /* @hide */
 @Backing(type="byte") @VintfStability
 enum StatusEvent {
-  PLUGIN_PHYSICAL_MODULE_CHANGED = 0,
-  PLUGIN_SESSION_NUMBER_CHANGED = 1,
+  PLUGIN_PHYSICAL_MODULE_CHANGED,
+  PLUGIN_SESSION_NUMBER_CHANGED,
 }
diff --git a/cas/aidl/android/hardware/cas/ICas.aidl b/cas/aidl/android/hardware/cas/ICas.aidl
index e6494ae..272cb10 100644
--- a/cas/aidl/android/hardware/cas/ICas.aidl
+++ b/cas/aidl/android/hardware/cas/ICas.aidl
@@ -35,6 +35,14 @@
     void closeSession(in byte[] sessionId);
 
     /**
+     * Open a session to descramble one or more streams without specifying intention
+     * and scrambling mode.
+     *
+     * @return sessionId The id of the newly opened session.
+     */
+    byte[] openSessionDefault();
+
+    /**
      * Open a session to descramble one or more streams by specifying intention
      * and scrambling mode.
      *
diff --git a/cas/aidl/android/hardware/cas/Status.aidl b/cas/aidl/android/hardware/cas/Status.aidl
index e7ae8ff..ba0bd65 100644
--- a/cas/aidl/android/hardware/cas/Status.aidl
+++ b/cas/aidl/android/hardware/cas/Status.aidl
@@ -31,50 +31,50 @@
      * The CAS plugin must return ERROR_CAS_NO_LICENSE, when descrambling is
      * attempted and no license keys have been provided.
      */
-    const int ERROR_CAS_NO_LICENSE = -1;
+    const int ERROR_CAS_NO_LICENSE = 1;
 
     /**
      * ERROR_CAS_LICENSE_EXPIRED must be returned when an attempt is made
      * to use a license and the keys in that license have expired.
      */
-    const int ERROR_CAS_LICENSE_EXPIRED = -2;
+    const int ERROR_CAS_LICENSE_EXPIRED = 2;
 
     /**
      * The CAS plugin must return ERROR_CAS_SESSION_NOT_OPENED when an
      * attempt is made to use a session that has not been opened.
      */
-    const int ERROR_CAS_SESSION_NOT_OPENED = -3;
+    const int ERROR_CAS_SESSION_NOT_OPENED = 3;
 
     /**
      * The CAS plugin must return ERROR_CAS_CANNOT_HANDLE when an unsupported
      * data format or operation is attempted.
      */
-    const int ERROR_CAS_CANNOT_HANDLE = -4;
+    const int ERROR_CAS_CANNOT_HANDLE = 4;
 
     /**
      * ERROR_CAS_INVALID_STATE must be returned when the device is in a state
      * where it is not able to perform descrambling.
      */
-    const int ERROR_CAS_INVALID_STATE = -5;
+    const int ERROR_CAS_INVALID_STATE = 5;
 
     /**
      * The CAS plugin must return BAD_VALUE whenever an illegal parameter is
      * passed to one of the interface functions.
      */
-    const int BAD_VALUE = -6;
+    const int BAD_VALUE = 6;
 
     /**
      * The CAS plugin must return ERROR_CAS_NOT_PROVISIONED when the device
      * has not yet been provisioned.
      */
-    const int ERROR_CAS_NOT_PROVISIONED = -7;
+    const int ERROR_CAS_NOT_PROVISIONED = 7;
 
     /**
      * ERROR_CAS_RESOURCE_BUSY must be returned when resources, such as CAS
      * sessions or secure buffers are not available to perform a requested
      * operation because they are already in use.
      */
-    const int ERROR_CAS_RESOURCE_BUSY = -8;
+    const int ERROR_CAS_RESOURCE_BUSY = 8;
 
     /**
      * The CAS Plugin must return ERROR_CAS_INSUFFICIENT_OUTPUT_PROTECTION
@@ -82,72 +82,72 @@
      * sufficient to meet the requirements in the license policy. HDCP is an
      * example of a form of output protection.
      */
-    const int ERROR_CAS_INSUFFICIENT_OUTPUT_PROTECTION = -9;
+    const int ERROR_CAS_INSUFFICIENT_OUTPUT_PROTECTION = 9;
 
     /**
      * The CAS Plugin must return ERROR_CAS_TAMPER_DETECTED if an attempt to
      * tamper with the CAS system is detected.
      */
-    const int ERROR_CAS_TAMPER_DETECTED = -10;
+    const int ERROR_CAS_TAMPER_DETECTED = 10;
 
     /**
      * The CAS Plugin must return ERROR_CAS_DEVICE_REVOKED if the response
      * indicates that the device has been revoked. Device revocation means
      * that the device is no longer permitted to play content.
      */
-    const int ERROR_CAS_DEVICE_REVOKED = -11;
+    const int ERROR_CAS_DEVICE_REVOKED = 11;
 
     /**
      * The CAS plugin must return ERROR_CAS_DECRYPT_UNIT_NOT_INITIALIZED when
      * descrambling is failing because the session is not initialized properly.
      */
-    const int ERROR_CAS_DECRYPT_UNIT_NOT_INITIALIZED = -12;
+    const int ERROR_CAS_DECRYPT_UNIT_NOT_INITIALIZED = 12;
 
     /**
      * The CAS Plugin must return ERROR_CAS_DECRYPT if the DescramblerPlugin's
      * descramble operation fails.
      */
-    const int ERROR_CAS_DECRYPT = -13;
+    const int ERROR_CAS_DECRYPT = 13;
 
     /**
      * ERROR_CAS_UNKNOWN must be returned when a fatal failure occurs and no
      * other defined error is appropriate.
      */
-    const int ERROR_CAS_UNKNOWN = -14;
+    const int ERROR_CAS_UNKNOWN = 14;
 
     /**
      * ERROR_CAS_NEED_ACTIVATION is used to trigger device activation process.
      */
-    const int ERROR_CAS_NEED_ACTIVATION = -15;
+    const int ERROR_CAS_NEED_ACTIVATION = 15;
 
     /**
      * ERROR_CAS_NEED_PAIRING is used to trigger pairing process.
      */
-    const int ERROR_CAS_NEED_PAIRING = -16;
+    const int ERROR_CAS_NEED_PAIRING = 16;
 
     /**
      * ERROR_CAS_NO_CARD is used to report no smart card for descrambling.
      */
-    const int ERROR_CAS_NO_CARD = -17;
+    const int ERROR_CAS_NO_CARD = 17;
 
     /**
      * ERROR_CAS_CARD_MUTE is used to report smart card is muted for
      * descrambling.
      */
-    const int ERROR_CAS_CARD_MUTE = -18;
+    const int ERROR_CAS_CARD_MUTE = 18;
 
     /**
      *  ERROR_CAS_CARD_INVALID is used to report smart card isn't valid.
      */
-    const int ERROR_CAS_CARD_INVALID = -19;
+    const int ERROR_CAS_CARD_INVALID = 19;
 
     /**
      *  ERROR_CAS_BLACKOUT is used to report geographical blackout.
      */
-    const int ERROR_CAS_BLACKOUT = -20;
+    const int ERROR_CAS_BLACKOUT = 20;
 
     /**
      * ERROR_CAS_REBOOTING is used to report CAS is during rebooting.
      */
-    const int ERROR_CAS_REBOOTING = -21;
+    const int ERROR_CAS_REBOOTING = 21;
 }
diff --git a/cas/aidl/default/CasImpl.cpp b/cas/aidl/default/CasImpl.cpp
index 2d31b35..f08fcc0 100755
--- a/cas/aidl/default/CasImpl.cpp
+++ b/cas/aidl/default/CasImpl.cpp
@@ -128,6 +128,19 @@
     return toStatus(holder->setPrivateData(pvtData));
 }
 
+ScopedAStatus CasImpl::openSessionDefault(vector<uint8_t>* sessionId) {
+    ALOGV("%s", __FUNCTION__);
+
+    shared_ptr<CasPlugin> holder = atomic_load(&mPluginHolder);
+    status_t err = INVALID_OPERATION;
+    if (holder.get() != nullptr) {
+        err = holder->openSession(sessionId);
+        holder.reset();
+    }
+
+    return toStatus(err);
+}
+
 ScopedAStatus CasImpl::openSession(SessionIntent intent, ScramblingMode mode,
                                    vector<uint8_t>* sessionId) {
     ALOGV("%s", __FUNCTION__);
diff --git a/cas/aidl/default/CasImpl.h b/cas/aidl/default/CasImpl.h
index 84a8115..2488a7f 100755
--- a/cas/aidl/default/CasImpl.h
+++ b/cas/aidl/default/CasImpl.h
@@ -53,6 +53,8 @@
 
     virtual ScopedAStatus setPrivateData(const vector<uint8_t>& pvtData) override;
 
+    virtual ScopedAStatus openSessionDefault(vector<uint8_t>* sessionId) override;
+
     virtual ScopedAStatus openSession(SessionIntent intent, ScramblingMode mode,
                                       vector<uint8_t>* sessionId) override;
 
diff --git a/cas/aidl/vts/functional/VtsHalCasAidlTargetTest.cpp b/cas/aidl/vts/functional/VtsHalCasAidlTargetTest.cpp
index 266b55d..4c904a8 100644
--- a/cas/aidl/vts/functional/VtsHalCasAidlTargetTest.cpp
+++ b/cas/aidl/vts/functional/VtsHalCasAidlTargetTest.cpp
@@ -286,6 +286,7 @@
     } OobInputTestParams;
 
     AssertionResult createCasPlugin(int32_t caSystemId);
+    AssertionResult openCasSessionDefault(vector<uint8_t>* sessionId);
     AssertionResult openCasSession(vector<uint8_t>* sessionId, SessionIntent intent,
                                    ScramblingMode mode);
     AssertionResult descrambleTestInputBuffer(const shared_ptr<IDescrambler>& descrambler,
@@ -331,6 +332,10 @@
     return AssertionResult(mDescrambler != nullptr);
 }
 
+AssertionResult MediaCasAidlTest::openCasSessionDefault(vector<uint8_t>* sessionId) {
+    return AssertionResult(mMediaCas->openSessionDefault(sessionId).isOk());
+}
+
 AssertionResult MediaCasAidlTest::openCasSession(vector<uint8_t>* sessionId, SessionIntent intent,
                                                  ScramblingMode mode) {
     return AssertionResult(mMediaCas->openSession(intent, mode, sessionId).isOk());
@@ -485,6 +490,32 @@
     ADD_FAILURE() << "ClearKey plugin not installed";
 }
 
+TEST_P(MediaCasAidlTest, TestClearKeyDefaultSessionClosedAfterRelease) {
+    description("Test that all sessions are closed after a MediaCas object is released");
+
+    ASSERT_TRUE(createCasPlugin(CLEAR_KEY_SYSTEM_ID));
+
+    EXPECT_TRUE(mMediaCas->provision(PROVISION_STR).isOk());
+
+    vector<uint8_t> sessionId;
+    ASSERT_TRUE(openCasSessionDefault(&sessionId));
+
+    vector<uint8_t> streamSessionId;
+    ASSERT_TRUE(openCasSessionDefault(&streamSessionId));
+
+    EXPECT_TRUE(mMediaCas->release().isOk());
+
+    if (mDescrambler != nullptr) {
+        auto status = mDescrambler->setMediaCasSession(sessionId);
+        EXPECT_FALSE(status.isOk());
+        EXPECT_EQ(Status::ERROR_CAS_SESSION_NOT_OPENED, status.getServiceSpecificError());
+
+        status = mDescrambler->setMediaCasSession(streamSessionId);
+        EXPECT_FALSE(status.isOk());
+        EXPECT_EQ(Status::ERROR_CAS_SESSION_NOT_OPENED, status.getServiceSpecificError());
+    }
+}
+
 TEST_P(MediaCasAidlTest, TestClearKeySessionClosedAfterRelease) {
     description("Test that all sessions are closed after a MediaCas object is released");