ISO/IEC INTERNATIONAL STANDARD 23736-4 First edition 2020-02 Information technology Digital publishing - EPUB 3.0.1 - Part 4: Open container format Technologies de Il'information-Publications numeriques-EPUB 3.0.1 Partie4:Formatde conteneurouvert Reference number IS0/IEC 23736-4:2020(E) IEC ISO @IS0/IEC2020 IS0/IEC23736-4:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 01 11 Fax: +41 22 749 09 47 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS0/IEC2020-Allrightsreserved IS0/IEC 23736-4:2020(E) Foreword Iso (the International Organization forStandardization)and IEC (theInternational Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IsO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. Iso and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with Iso and IEC, also take part in the work. The procedures used to develop this document and those intended for its further maintenance are described in the ISo/IEc Directives, Part 1. In particular, the different approval criteria needed for the different types of document should be noted (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. Iso and IEC shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISo list of patent declarations received (see www.iso.org/patents) or the IEC list of patent declarations received (see http://patents.iec.ch). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation of the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about Iso's adherence to the World see www.iso.org/iso/foreword.html This document was prepared by the World Wide Web Consortium (W3C) [as EPUB Open Container Format (OCF) 3.0.1) and drafted in accordance with its editorial rules. It was adopted, under the JTC 1PAS procedure, by Joint Technical Committee ISO/IEC JTC1, Information technology. AlistofallpartsintheISO/IEC23736seriescanbefoundontheISOwebsite. Any feedback or questions on this document should be directed to the user's national standards body.A completelisting ofthesebodies canbefound atwww.iso.org/members.html. IS0/IEC 2020-All rights reserved ii