tl;dr Commerical entity is paying to have the ISO altered to "legalize" their SDK they are pushing which is incompatible with standard PDF readers.

ISO is pay to play so :shrug:

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whizzx 5 hours ago | parent | next [-]

No this feature is coming straight from the PDF association itself and we just added experimental support before it's officially in the spec to help testing between different sdk processors.

So your comment is a falsehood

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lmz 6 hours ago | parent | prev | next [-]

It's not even clear that they were the ones suggesting inclusion. They're just saying their library now supports the new thing.

https://pdfa.org/brotli-compression-coming-to-pdf/

> As of March 2025, the current development version of MuPDF now supports reading PDF files with Brotli compression. The source is available from github.com/ArtifexSoftware/mupdf, and will be included as an experimental feature in the upcoming 1.26.0 release.

> Similarly, the latest development version of Ghostscript can now read PDF files with Brotli compression. File creation functionality is underway. The next official Ghostscript release is scheduled for August this year, but the source is available now from github.com/ArtifexSoftware/Ghostpdl.

	▲	adrian_b 4 hours ago \| parent [-]
		Yes, I do not see any source of financial gain that could motivate them for this, because both MuPDF and Ghostscript are free. MuPDF is an excellent PDF reader, the fastest that I have ever tested. There are plenty of big PDF files where most other readers are annoyingly slow. It is my default PDF and EPUB reader, except that in very rare cases I encounter PDF files which MuPDF cannot understand, when I use other PDF readers (e.g. Okular).

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bhouston 6 hours ago | parent | prev [-]

I'm no fan of Adobe, but it is not that hard to add brotli support given that it is open. Probably can be added by AI without much difficulty - it is a simple feature. I think compared to the ton of other complex features PDF has, this is an easy one.