If you copy the exact texts, you may fall into duplicates, because Google algorithm, checks fragments not the whole text. There is an unknown % of what is considered "duplicate", but most people assume at least a 50% of exact match (some may assume less depending how much you fear it)..
(...) you may face a DMCA complaint for both the book or the expired article if the original author detects this. In that case, you page will be delisted from Google ranks (...).
What country are you in? Is there any identifying information on your site as to your personal location?Thank you very much for your answer. I suppose I will receive a warning or something like that before being delisted.
What country are you in? Is there any identifying information on your site as to your personal location?
Most likely isn't worth the possibility of being delisted. It would be best to modify the articles enough to the point that you can claim them as your own.