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I believe the authors have made a very late draft available, as they have been unable to work around the processes that prevent them releasing the actual standard.

The person who recently re-implemented it in C mentioned this.

I thought it was in the Readme but maybe it was a comment here at HN:

https://github.com/lifthrasiir/j40

Found it:

https://news.ycombinator.com/item?id=32885536

You can download the ISO docs from the usual places you pirate books.

I wish it were that simple, newer ISOs or papers take months or more to find its way. If I had 200 bucks to spare, I'd do it myself

Like https://en.wikipedia.org/wiki/Library_Genesis

You can probably learn something from what is available on jpeg.org and jpegxl.info, as well as looking at the libjxl or j40 implementations. Is there anything in particular you would like to know?

i just want to write a rust binding to the existing j40 and learn about its implementation while I am at it (always has been fascinated by file formats)

If you are interested in making a J40 binding in Rust, please also take a look at the future Rust version itself. I've made an initial issue [1] about this effort.

[1] https://github.com/lifthrasiir/j40/issues/10

come to discord to talk about JXL