Epub Book Usage Rights

Summary

In the US, copyright law generally prohibits reproducing, distributing, or altering a copyrighted work without permission. However, fair use may allow limited use for research purposes. This is a complex area, so it is advisable to consult a copyright lawyer for specific advice.

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I’m curious if a book seller provides an epub format of a book, would the purchaser of the epub be allowed to allow a third party to vector index that book so they can use that book as context for questions, for example a research assistant purchase a book and wants to use a third party provider to attempt to glean useful insights from said epub.
Hello ****, this situation might involve copyright laws. Could you please let me know which country's laws should we consider in this case?
US
In the US, copyright law generally disallows reproducing, distributing, or altering a copyrighted work without permission. However, fair use may allow limited use for research. This is a complex area, so consult a copyright lawyer for specific advice.