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I'll also note that "expecting very low sales" and "worrying about copy protection" are mutually exclusive. If no one is interested in buying, then no one is interested in stealing, either.
For her piece of mind, she might want to consider some form of watermarking. That will not inconvenience legitimate users, and will allow her to spot illegal copies if she ever comes across one. Which, if her prediction of low interest proves true, is highly unlikely.
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