After the attacks largely abated Friday, they restarted at 3 a.m. PST Saturday until 11 p.m. Sunday, said Blake Stowell, a spokesman for SCO. The deluge of data, known as a denial-of-service attack, restarted Monday morning, and the company's Web site continues to be inaccessible.

"At this point, we are continuing to use the same tactics: keeping in contact with our Internet service provider and the U.S. Secret Service," Stowell said.

The Web site and file servers have been inaccessible for five of the last seven days. If such attacks continue, the company could find itself unable to communicate with customers.

Groklaw, a legal analysis site that has been critical of SCO, cast doubt on the company's claims that it can't do anything about the attack. Such attacks can usually be largely mitigated by buying up more bandwidth and connecting through Internet service providers that have special technology aimed to defeat the assaults.

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