I was reading some mathematics books and I observed that most of them have either of these mentioned before preface.
Copyright: All right reserved by XYZ
Copyright: All rights reserved. No part of this book may be reproduced in any form without the written permission of the publishers.
I am actually travelling next week and I won't be able to carry the books physically. I was thinking of downloading the PDFs of the book from sites like Libgen.
I think it would be illegal and unethical to do that in case II because writer strictly prohibits that.
Am I free to download and read the PDF of the book in Case I.
P.S.: I live in India.