Quote:
Originally Posted by Jellby
If your concern is not so much preventing modification, but being able to tell whether the book is the original or a modified copy, you can always publish some checksum like md5 or sha-256. That way your readers could verify that their copy is identical to the one approved by you.
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Theoretically, the OP could add a
signatures.xml file to the META-INF folder of epub3 books. But they'd have to provide their own custom validation tool.
Moreover,
the W3C stated:
Quote:
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Adding a digital signature is not a guarantee that a malicious actor cannot tamper with an EPUB publication as reading systems do not have to check signatures.
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(emphasis mine)