Norton Internet Security (Windows versions) have been criticized for refusing to uninstall completely, leaving unnecessary files behind. Versions prior to 2009 installed a separate LiveUpdate program, which updates Norton-branded software. The user must uninstall both Norton Internet Security and the LiveUpdate component manually. The LiveUpdate component is purposely left behind to update other Norton-branded products, if present. In response, Symantec developed the Norton Removal Tool to remove leftover registry keys and values along with files and folders. Uninstallation will not remove subscription data, preserved to prevent users from installing multiple trial copies.