Buying authenticity: plagiarism checking and counter-checking

Alex Tabarrok on Marginal Revolution posted about how the software company Turnitin is not just helping schools detect student plagiarism, but also providing WriteCheck, a tool for checking that a paper is non-infringing. Are they providing a useful service for conscientious students to avoid unconscious infringement, or just playing both sides of the fence, profiting from an arms race where they sell all the arms?

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