Vista copy protection is defended

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Microsoft has defended the digital rights management systems integrated into its new Vista operating system.

It follows reports that Vista would 'downgrade' the quality of all video and audio, if they were not output via approved connections on the PC.

Microsoft said only the quality of 'premium content' would be lowered, and only if requested by copyright holders.

The measures are in place, says the firm, to protect content such as high definition movies from being copied.

Vista's copy protection systems have come under fire from many quarters, including recently from Peter Gutmann, a computer science lecturer at the University of Auckland.

In a report looking at the impact Vista would have on video and audio playback, he described Vista's Content Protection specification as 'the longest suicide note in history'.

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