Yeah, that's the point I'm making. I'm very confident he has broken those rules, and his posts are auto-translated from (probably) a Spanish source. After reporting many, many other users for the same thing, it becomes fairly obvious after a while. But unless someone can definitively find one of those sources, then we don't have any hard proof on which to issue a ban.
"A Random Walk Down Wall Street" book can be read at:
http://site.iugaza.edu.ps/wdaya/files/2013/03/A-Random-Walk-Down-Wall-Street.pdfOn page-4, you will see this:
Copyright © 1999, 1996, 1990, 1985, 1981, 1975,
1973
by W. W. Norton & Company, Inc.
All rights reserved
Printed in the United States of America
"The Little Book That Still Beats the Market" book can be read at:
http://www.poslovni.hr/media/PostAttachments/1203672/Joel%20Greenblatt%20-%20The%20Little%20Book%20That%20Beats%20the%20Market.pdfCheck on page 6, you will see the copyright of that book.
About the "copyright limitations and exceptions", you can read on
https://en.wikipedia.org/wiki/Copyright#Limitations_and_exceptionsYou can report the plagiarism with that prove.