Working Model, a physics simulator for the 68K Mac, did that. "Enter the last word on page NNN". For one release, the manual got some minor modification just before printing, changing the pagination of the last chapters. If the page number was in the first 3/4 of the book, it worked, but if in the last quarter, it didn't. Paying customers very annoyed.
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look-up-a-word-in-the-manual copy protection.
Working Model, a physics simulator for the 68K Mac, did that. "Enter the last word on page NNN". For one release, the manual got some minor modification just before printing, changing the pagination of the last chapters. If the page number was in the first 3/4 of the book, it worked, but if in the last quarter, it didn't. Paying customers very annoyed.