code: public ContentKeyPolicyInner update(String resourceGroupName, String accountName, String contentKeyPolicyName, ContentKeyPolicyInner parameters) {
          return updateWithServiceResponseAsync(resourceGroupName, accountName, contentKeyPolicyName, parameters).toBlocking().single().body();
      }
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
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ApiErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ContentKeyPolicyInner object if successful.