What is the difference between these two definitions?

Norton Security | Norton Internet Security
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This morning I ran live update and the following definitions were downloaded: Norton 2010 Iron Whitelist Norton 2010 Web Protection Definitions Norton 2010 Virus Definitions Norton 2010 Pulse Updates Norton 2010 Web Protection Definitions (hub) What is the difference between these two: Norton 2010 Web Protection Definitions & Norton 2010 Web Protection definitions (hub) ?

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Can anyone help me to understand the difference between the two definitions?