Most individual investors harbor a guilty secret: They know they should invest in sensible, low-fee index funds but can't resist the lure of money managers who promise to beat the market.

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But nobody could tell for sure because no one got to look at the guilty source code, which Microsoft claimed as a trade secret.

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Moreover, it says Chu and his clients worked hard to keep his communications secret, a so-called badge of knowledge that prosecutors can use to try and prove guilty intent.

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