A Digital Rights Management (DRM) or encryption to prevent unauthorised copying of files or piracy is automatically provided when selling through Apple iBooks and Amazon, who both restrict eBooks to be read on their proprietary devices owned by the eBook purchaser. Kobo and other eBookstores include DRM through Adobe Content Management. It is possible to sell eBooks from your own website, but arranging encryption through Adobe is very expensive. Please note: DRM is by no means full proof, and can limit legitimate activities.
The author automatically owns the copyright of their work, and copyright is not compromised by distribution of the work in digital form. The copyright statement declares but does not create the copyright.
A typical copyright statement: Copyright © 2016 by Arthur Higgins
There may be an additional paragraph for example:
All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted by copyright law.
International Standard Book Numbers (ISBNs) are available from Nielsen in the UK in blocks of 10. It is not essential to have an ISBN for eBooks sold through Apple iBookstore or Amazon, but it is highly recommended if you wish to extend your sales to other retailers. There should be a different iSBN for each format of the title: hardback, paperback, ePub and mobi.