}
					keys = keys[1:]
				}
				batch[i].ETag = ETag.Format().String()
			}
		}
		objects = objects[N:]
	}
	return nil
}

// isMultipart returns true if the current object is
// uploaded by the user using multipart mechanism:
// initiate new multipart, upload part, complete upload
func (o *ObjectInfo) isMultipart() bool {
	_, encrypted := crypto.IsEncrypted(o.UserDefined)
	if encrypted {