And, of course, if you choose not to pay for such software and pirate it instead, outfits like the Microsoft-backed Business Software Alliance will turn your former employees into tipsters, audit your software use and sue you.

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According to AICPA rules for auditor independence, PwC can support software development and implementation for its audit client if that system is not the financial accounting software that produces the books and records the firm will audit.

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Free versions of security audit software exist, but they tend to find so many false positives, or problems that turn out to be nothing, that developers stop using these tools.

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