chore: add license text

Author: imabhichow

src/examples/java/com/amazonaws/crypto/examples/keyrings/MultiKeyringExample.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings;
 
 import com.amazonaws.encryptionsdk.AwsCrypto;

src/examples/java/com/amazonaws/crypto/examples/keyrings/hierarchical/CreateBranchKeyId.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings.hierarchical;
 
 import static com.amazonaws.encryptionsdk.kms.KMSTestFixtures.TEST_KEYSTORE_KMS_KEY_ID;

src/examples/java/com/amazonaws/crypto/examples/keyrings/hierarchical/ExampleBranchKeyIdSupplier.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings.hierarchical;
 
 import software.amazon.cryptography.materialproviders.IBranchKeyIdSupplier;

src/examples/java/com/amazonaws/crypto/examples/keyrings/hierarchical/VersionBranchKeyId.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings.hierarchical;
 
 import static com.amazonaws.encryptionsdk.kms.KMSTestFixtures.TEST_KEYSTORE_KMS_KEY_ID;

src/main/java/com/amazonaws/encryptionsdk/CMMHandler.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.encryptionsdk;
 
 import com.amazonaws.encryptionsdk.internal.Utils;

src/test/java/com/amazonaws/crypto/examples/keyrings/AwsKmsHierarchicalKeyringExampleTest.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings;
 
 import com.amazonaws.crypto.examples.keyrings.hierarchical.AwsKmsHierarchicalKeyringExample;

src/test/java/com/amazonaws/crypto/examples/keyrings/RawAesKeyringExampleTest.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings;
 
 import java.nio.ByteBuffer;

src/test/java/com/amazonaws/crypto/examples/keyrings/RawRsaKeyringExampleTest.java

@@ -1,3 +1,6 @@
+// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
 package com.amazonaws.crypto.examples.keyrings;
 
 import java.nio.ByteBuffer;