Windows Vista can be run for at least a year without being activated, a serious end run around one of Microsoft's key antipiracy measures, Windows expert Brian Livingston said Thursday.

Livingston, who publishes the Windows Secret newsletter, said that a single change to Vista's registry lets users put off the operating system's product activation requirement an additional eight times beyond the three disclosed last month. With more research, said Livingston, it may even be possible to find a way to postpone activation indefinitely.

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