Re: [PNG] Meeting topics - Oct 27th, 2025

Thanks Chris!

I commented on the PR - both on the issue at hand and also on the text itself (Thanks Chris L for the text!).

Leonard

From: Chris Blume (ProgramMax) <programmax@gmail.com>
Date: Sunday, October 26, 2025 at 1:49 PM
To: Leonard Rosenthol <lrosenth@adobe.com>
Cc: Portable Network Graphics (PNG) Working Group <public-png@w3.org>
Subject: Re: [PNG] Meeting topics - Oct 27th, 2025


EXTERNAL: Use caution when clicking on links or opening attachments.


I would love your input, Leonard.
The issue/concern was raised in this GitHub comment<https://github.com/w3c/png/pull/544#issuecomment-3417689319>.

I am trying to catch up on several things and haven't yet gotten around to this. That is why I was vague and unsure when listing the discussion topic. My hope is that it is a misunderstanding of what C2PA can & can't do.

On Sun, Oct 26, 2025 at 11:31 AM Leonard Rosenthol <lrosenth@adobe.com<mailto:lrosenth@adobe.com>> wrote:
@Chris Blume (ProgramMax)<mailto:programmax@gmail.com> - happy to chat about C2PA (and PNG) at the meeting on Monday, but curious who is raising the issues and what the overall concern is - either in general, or for PNG or both.

Leonard

From: Chris Blume (ProgramMax) <programmax@gmail.com<mailto:programmax@gmail.com>>
Date: Friday, October 24, 2025 at 4:30 PM
To: Portable Network Graphics (PNG) Working Group <public-png@w3.org<mailto:public-png@w3.org>>
Subject: [PNG] Meeting topics - Oct 27th, 2025


EXTERNAL: Use caution when clicking on links or opening attachments.


Hello everyone,

This coming Monday is a PNG WG meeting. I think we should discuss:

  *   C2PA apparently has some problems. The chunk can be removed, sure. And a new chunk could be created to claim ownership. This much is expected. You would need to look at the dates on the claims, right? But maybe there are problems beyond that?
  *   TPAC 2025 is coming up shortly. We have a time slot to meet and also give other groups more vision into our work. I expect we'll give a summary of our work so far and field questions. Let's discuss what we should have prepared for TPAC.

See you Monday!