Norton LiveUpdate
（重定向自Live Update）
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Norton LiveUpdate is an application developed by Symantec Corporation that downloads and installs security updates (such as spyware, firewall, or antivirus signature files) and software patches. LiveUpdate can only apply updates for a particular version of Norton; it cannot however upgrade a version of Norton to a later version (for example Norton Internet Security 2006 to 2009). To upgrade the product to the latest version, one would have to go to a separate website.