A while ago, there was a PR announcing that VMware was opening its VMDK specification with GPL compatible licensing. While anyone can get the specification document, provided they fill a form, I haven’t seen any note, on the document itself or anywhere else than the PR that this indeed allows an open source implementation.
The only thing that remotely ressembles licensing of the document could be
To ensure that readers of this specification have access to the most current version, readers may download copies of this specification from www.vmware.com and no part of this specification (whether in hardcopy or electronic form) may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of VMware, Inc., except as otherwise permitted under copyright law. Please note that the content in this specification is protected under copyright law even if it is not distributed with software that includes an end user license agreement. This specification and the information contained herein is provided on an “AS-IS” basis, is subject to change without notice, and to the maximum extent permitted by applicable law (…)
But this is more about the document itself than about the use of the specification. IANAL, but without more terms, the point of being able to read this specification is moot. It could even be patented and enforced…
Anyone with a better clue ?