code: public ServiceFuture<ContentKeyPolicyInner> updateAsync(String resourceGroupName, String accountName, String contentKeyPolicyName, ContentKeyPolicyInner parameters, final ServiceCallback<ContentKeyPolicyInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(resourceGroupName, accountName, contentKeyPolicyName, parameters), serviceCallback);
      }
docs: Update a Content Key Policy.
  Updates an existing Content Key Policy in the Media Services account.
  
  @param resourceGroupName The name of the resource group within the Azure subscription.
  @param accountName The Media Services account name.
  @param contentKeyPolicyName The Content Key Policy name.
  @param parameters The request parameters
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object