Re: Embedding C2PA metadata in PNG

We haven't considered this as a group. This is the first I've heard of it.
I like the idea. Although, maybe it should be a topic for PNG 5e instead of
4e.

We're quite behind schedule on 4e. A lot of this is simply because we're
blocked waiting on other specs. We're supposed to have a First Public
Working Draft soon.
Since we're blocked, we could perhaps amend the 4e plans to include it. But
if there isn't pressure to include it quickly, I personally would prefer to
add it to 5e. I'm open to the group's thoughts here.

On Fri, Aug 22, 2025 at 12:49 AM Fares Alhassen <falhassen@google.com>
wrote:

> Dear all,
>
> The C2PA specification has a private caBX tag for C2PA metadata (which is
> encoded in a JUMBF box):
> https://spec.c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification.html#_special_consideration_for_png
>
> I was wondering if the W3C PNG group has considered making C2PA a part of
> PNG 4e as well and working with the C2PA organization to graduate it to an
> officially supported feature of PNG. I'm happy to talk about it in our next
> meeting (along with the gainmap discussion).
>
> Sincerely,
> Fares
>