Meeting topics for March 19th, 2023

Hello everyone,

I apologize for the late email. I had friends visiting this week and lost
track of time.

Topics for our March 19th meeting:

   - Friday, March 24th is when the PNG patent disclosure period ends. Our
   next step will be Candidate Recommendation, which requires us to
close issues
   marked blocking-3rd-edition-cr
   <https://github.com/w3c/PNG-spec/issues?q=is%3Aissue+is%3Aopen+label%3Ablocking-3rd-edition-cr>
and
   gathering implementation experience.
      - We now have 2 WPT tests live
      <https://wpt.fyi/results/png?label=master&label=experimental&aligned&view=subtest&q=png>
      .
         - Although, it looks like the cicp test harness is now failing?
         I'll investigate.
      - We have reached to Mozilla
      <https://bugzilla.mozilla.org/show_bug.cgi?id=1821750> and libpng
      <https://github.com/glennrp/libpng/issues/471> to learn how they want
      to proceed with implementation.
   - Acropalypse was announced.
   <https://twitter.com/ItsSimonTime/status/1636857478263750656>
      - It works via cropping an image so it uses less data. When the newly
      cropped image is saved, the file isn't truncated down to the
smaller size.
      This means data from the original, uncropped image is still in the file.
      Using the Huffman table from the cropped image, parts of the uncropped
      image can be reconstructed. (Or that is my understanding, at least.)
      - We already have a bug open to warn about data stored after the end
      of the image <https://github.com/w3c/PNG-spec/issues/170>.
      - Should we encourage or require decoders to not display an image
      with extra data? That might have helped people catch their
mistake. But the
      image is still valid and so not displaying it might be heavy handed.
   - The Privacy IG has gotten back to us with suggested changes
   <https://github.com/w3c/PNG-spec/issues/282>. Would anyone be interested
   in mentioning these privacy concerns in the privacy section of the spec?


Thanks everyone!
See you at the meeting tomorrow.