The computer giant has sued three men for releasing preview versions of its latest Mac OSX software onto file-sharing sites prior to its release.
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It said two versions of the operating system, codenamed Tiger, were put onto the net in October and December.
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It is the second time in two weeks Apple has taken legal action to protect its future products. Tiger is due to be shipped in early 2005.
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Last week, it filed a lawsuit against "unnamed individuals" who leaked details about new products onto the web. 