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diff --git a/luni/src/main/java/javax/crypto/SecretKey.java b/luni/src/main/java/javax/crypto/SecretKey.java
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+++ b/luni/src/main/java/javax/crypto/SecretKey.java
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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package javax.crypto;
+
+import java.security.Key;
+
+/**
+ * A cryptographic secret (symmetric) key.
+ * <p>
+ * This interface is a <i>marker interface</i> to group secret keys and to
+ * provide type safety for.
+ * <p>
+ * Implementations of this interface have to overwrite the
+ * {@link Object#equals(Object) equals} and {@link Object#hashCode() hashCode}
+ * from {@link java.lang.Object} so comparison is done using the actual key data
+ * and not the object reference.
+ */
+public interface SecretKey extends Key {
+
+    /**
+     * The serialization version identifier.
+     *
+     * @serial
+     */
+    public static final long serialVersionUID = -4795878709595146952L;
+}
+\ No newline at end of file