code: public void save(final OutputStream out) throws IOException {
          final ZipUTF8WriterBuilder builder = ZipUTF8WriterImpl.builder();
          final ZipUTF8Writer writer = builder.build(out);
          this.save(writer);
          writer.finish(); // ensures the zip file is well formed
          writer.flush();
      }
docs: Writes the document to a stream.
  WARNING: The user shall close the stream (since 0.6.1).
  
  @param out The OutputStream that should be used.
  @throws IOException The file can't be saved.