Copyrights and Trademarks

Copyright © 2020 Sophos Limited. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise unless you are either a valid licensee where the documentation can be reproduced in accordance with the license terms or you otherwise have the prior permission in writing of the copyright owner.

Sophos and Sophos Anti-Virus are registered trademarks of Sophos Limited and Sophos Group. All other product and company names mentioned are trademarks or registered trademarks of their respective owners.

The Sophos ES100 Email Appliance, the Sophos ES1000 Email Appliance, the Sophos ES1100 Email Appliance, the Sophos ES4000 Email Appliance, the Sophos ES5000 Email Appliance, the Sophos ES8000 Email Appliance, and the Sophos Virtual Email Appliance are all licensed in accordance with the terms of the Sophos Appliance License Agreement. A copy of this license agreement can be found at

This Sophos appliance includes or may include:

  • Software developed by the OpenSSL Project for use in the OpenSSL Toolkit (
  • Cryptographic software written by Eric A. Young and software written by Tim J. Hudson.
  • Software originally written by David Turner, Robert Wilhelm, and Werner Lemberg. Portions of this software are copyright © 2006 The FreeType Project
  • Software originally written by Thomas G. Lane. This software is based in part on the work of the Independent JPEG Group.
  • Software written by Victor A. Abell. Portions of this software are copyright © 1994 Purdue Research Foundation.
  • Software originally written by Jean-loup Gailly and Mark Adler.
  • Software developed by the Apache Software Foundation ( A copy of the license agreement for this software can be found at
  • Software licensed under the IBM Public License Version 1.0 which permits the user to have access to the source code for such software. The source code of postfix is available free of charge at
  • Some software programs are licensed (or sublicensed) to the user under the GNU General Public License (GPL) or other similar Free Software licenses, which, among other rights, permit the user to copy, modify and redistribute certain programs, or portions thereof, and have access to the source code. The GPL requires for any software licensed under the terms of the GPL, which is distributed in an executable binary format, that the source code for such software also be made available to the users of the binary form. For any such software covered under the GPL, the source code is available via mail order by submitting a request to Sophos; via email to or via the web at A copy of the license agreement for any such included software can be found at
  • Source code of some libraries that are licensed (or sublicensed) to the user can be downloaded at Copies of the license agreements for those libraries are included in the download.
  • In this product open-vm-tools is used at arms-length from Sophos proprietary code.