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StreamShield's combined software and hardware platforms are designed to scan up to 250,000 Web page requests and 5,000 emails each second without diminishing network performance.

Unlike firewalls and IDS/IPS products, which operate on packets, the StreamScan scanning engine analyses the entire content stream in real-time allowing it to detect more complex threats.

Based on a massively parallel real-time streaming architecture, the company claims that its StreamScan delivers the fastest performance in the industry.

'We believe that clean Internet services provided in the network will protect customers from the growing range of Internet threats and provide value to our business,' said Dean Sadler, development director at PlusNet. 'We are pleased to be trialling StreamShield's technology as part of our overall approach to customer security.'

StreamShield notes that in a recent NOP survey 51 per cent of those questioned wanted their ISPs to block spyware. However, it says, only 30 per cent of ISPs have deployed the requisite tools.