Call for Exclusions: Portable Network Graphics (PNG) Specification (Third Edition)

Dear Advisory Committee Representatives, Team Contact, 

This is a W3C Patent Policy Call for Exclusions for the following
Recommendation Track document upon publication of a Patent Review Draft.

  Portable Network Graphics (PNG) Specification (Third Edition)
  exclusion opportunity ending on 2023-11-20
  This specification was produced by:
      - the Portable Network Graphics (PNG) Working Group
If you do not wish to exclude patent claims during this exclusion
opportunity, no further action is required. Member participants who
think their organization may have patent claims to exclude should
contact their Advisory Committee Representative.

This Recommendation Track document is being developed under the 2020 W3C
Process Document and Patent Policy.

Participants made a Royalty-Free licensing commitment upon joining
this Working Group. With the publication of this Patent Review Draft, per
section 4.1 of the Patent Policy [1], Participants have an opportunity
until 2023-11-20 to exclude patent claims reading on this Patent
Review Draft. In this exclusion opportunity, exclusions are limited
to matter in the Patent Review Draft that was not present or
apparent at a previous exclusion opportunity.
Note that other exclusion opportunities may still be open on the same document,
covering earlier material.

Excluded claims are not subject to the licensing requirements of the W3C
Patent Policy for this document. For more information about exclusions,
please see

To make exclusions, please use the following form

Summary information for this group related to the W3C Patent Policy is
available at:

If you have any questions or need further information, please contact,
for the Portable Network Graphics (PNG) Working Group:
    Chris Lilley <>
Thank you,

Philippe le H├ęgaret, W3C Strategy and Project Lead;
Xueyuan Jia, W3C Marketing & Communications


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Received on Thursday, 21 September 2023 23:59:14 UTC