code: public Observable<AssetStorageEncryptionKeyInner> getEncryptionKeyAsync(String resourceGroupName, String accountName, String assetName) {
          return getEncryptionKeyWithServiceResponseAsync(resourceGroupName, accountName, assetName).map(new Func1<ServiceResponse<AssetStorageEncryptionKeyInner>, AssetStorageEncryptionKeyInner>() {
              @Override
              public AssetStorageEncryptionKeyInner call(ServiceResponse<AssetStorageEncryptionKeyInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets the Asset storage key.
  Gets the Asset storage encryption keys used to decrypt content created by version 2 of the Media Services API.
  
  @param resourceGroupName The name of the resource group within the Azure subscription.
  @param accountName The Media Services account name.
  @param assetName The Asset name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the AssetStorageEncryptionKeyInner object