Hi,
On 9 Jun 2021, at 16:41, Pablo Rodriguez
wrote: Only mupdf-gl sees the signature annotation after signing it. Acrobat, Evince, Okular and xpdf cannot deal with the signature.
Just FYI: On the Mac, I can sign the processed example using Adobe Acrobat Reader DC, and it can save a signed pdf as well as re-open it, including showing that verification bar that says it is a signed pdf. mupdf-gl ‘sees’ the original field also, but mine is compiled without openssl so it cannot actually sign. It happily correctly opens the signed version from AR DC, of course. Apple Preview does not recognize the signature field (well, it has zero support for signing to begin with, so that is not a surprise). — Taco Hoekwater E: taco@bittext.nl genderfluid (all pronouns)