I have been looking that many books published with copyright notice like:
Copyright © by [abc] publication.
All rights reserved. No part of this publication may be reproduced, copied, or stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the written permission of the copyright owner.
Now I want to know:
- How long this copyright last or sustain?
- Can books used as in public domain after expiration of copyright?
- If a book doesn't have any copyright notice, then can it be used as if it were in the public domain?
- How do I check whether a book is copyrighted or not in case of no copyright notice?
Note: my concern is for scanned versions of books.
Excuse my poor knowledge in this area!