For books under copyright, obtain them from a legitimate source, and it is highly unlikely there will be malicious edits. For public domain books, in principle it is possible for someone to make malicious edits. If you're really that concerned about malicious edits, then don't download the free version, buy one from a reputable publisher - for such a book there's no reason to be more suspicious of an e-book than a paper book.
But how many cases of malicious edits have there ACTUALLY been with free public domain books?
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