AddPackage

public void AddPackage(XmpPackage package)

using (Metadata metadata = new Metadata(Constants.InputJpeg))
{
    IXmp root = metadata.GetRootPackage() as IXmp;
    if (root != null)
    {
        var packet = new XmpPacketWrapper();

        var custom = new XmpPackage("gd", "https://groupdocs.com ") ;
        custom.Set("gd:Copyright", "Copyright (C) 2011-2022 GroupDocs. All Rights Reserved.");
        custom.Set("gd:CreationDate", DateTime.Today);
        custom.Set("gd:Company", XmpArray.From(new [] { "Aspose", "GroupDocs" }, XmpArrayType.Ordered));

        packet.AddPackage(custom);
        root.XmpPackage = packet;

        metadata.Save(Constants.OutputJpeg);
    }
}