Web filtering has evolved from addressing access to URLs to more complex web filtering solutions that address the web security needs of a networked business world.

Web security concerns have been heightened, due to the rash of web-based viruses and malicious mobile code (e.g., NIMDA, Code Red, and Bugbear) that have escaped traditional signature-based antivirus software. More users rely on protocols such as streaming media, peer-to-peer (P2P), and instant messaging. Spyware is no longer just a consumer nuisance; it is quickly becoming a major security and productivity concern in the corporate environment. The growing number of "phishing attacks" has opened corporate eyes to the threat spyware poses to information security.

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