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This is actually not true at all. Any one can contribute to an update list. rename any ulz file to zip and you can extract the compressed ul file. This can then be renamed to .xml and edited. Once edited you can then rename the xml to ul and then zip the file and rename the zip to ulz. The windows update downloader available at http://www.windowsupdatesdownloader.com/ProgramFiles.aspx can use these files with out any kind of license