code: public void setDestinationSSECustomerKey(SSECustomerKey sseKey) {
          if (sseKey != null && this.sseAwsKeyManagementParams != null) {
              throw new IllegalArgumentException(
                  "Either SSECustomerKey or SSEAwsKeyManagementParams must not be set at the same time.");
          }
          this.destinationSSECustomerKey = sseKey;
      }
docs: Sets the optional customer-provided server-side encryption key to use to
  encrypt the destination object being copied.
  
  @param sseKey
  The optional customer-provided server-side encryption key to
  use to encrypt the destination object being copied.