See this answer to your duplicate question: The revision with the troublesome signature contains errors: The Length entries of all streams are incorrect. When validating the file as is, with the troublesome signature covering the whole file, Acrobat essentially only checks the signed hash value when checking for file changes, and so can succeed.  But when validatingf the file with additional incremental updates, Acrobat applies additional checks when checking for file changes, and these checks are very sensitive to structural PDF errors.   You ask "Acrobat bug?" - the actual bug is that Acrobat (and virtually every other PDF viewer) don't immediately reject test.pdf or at least warn their users that test.pdf has multiple structural errors which may result in any kind of later misbehavior. ... View more

The Application instructions indicate that you may need to "print as PDF" to save as a new PDF file before you can sign, but neither Reader nor Acrobat Pro allows this!   The online instructions say: This is possible using the current Acrobat Pro.   That been said, where exactly did you get your PDF file from and which Acrobat version do you use? I just googled and found https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/imm5532.html for which the security settings in the current Adobe Acrobat Pro indicate that signing is allowed. (I tested with the current Windows version.) ... View more

There is an error in the way that "Assinado digitalmente" has been added to each page of the document.   For example on page 1: That symbol has been added to the page by additionally showing a form XObject FFT0 which in turn shows a form XObject F0 which then shows a bitmap image Im1. The error is in the form XObject F0: q 1 0 0 1 2.8346 3.8346 cm 0.1867 0 0 0.1867 0 0.0934 cm q 167 0 0 166 0 0 cm /Im1 Do Q Q Q As you can see, there is a closing Q (restore-graphics-state) too many.   Some viewers ignore this kind of error. But while this error is indeed easy to ignore technically, it often indicates that somewhere there is a missing q (save-graphics-state) before that extra Q, and that the content between that missing q and the final extra Q  is displayed incorrectly (at the wrong position, at the wrong scale, in wrong colors, ...). Thus, it is sensible that Acrobat does not show that broken XObject but warn instead.   You should inform the producer of that PDF about the error in their PDFs and ask them for a copy without it. ... View more

Ich fürchte, für eine tatsächliche Analyse werden nicht nur solche Metadaten sondern das tatsächliche PDF benötigt. Ich selbst habe allerdings nicht die notwendige Erfahrung, um solch eine Analyse ernsthaft durchzuführen.   ... View more

Have you activated some option to include all the validation related information required for "LTV-enabling" the signature? In that case you may now suddenly include a full CRL instead of merely a small OCSP response. This can happen whenever the servers of your certificate authority have issues.   Without more details, though, this essentially is plain guesswork. ... View more

Well, as long as you don't forward your translation to arbitrary others, ISO likely won't care.  In that case, just as @try67 mentioned: That PDF originally has been published without encryption. You may still find such a copy on the web. And another option: ISO 32000-1 actually is somewhat outdated. Since 2017 there has been ISO 32000-2 of which an update has been published in 2020. Also there are numerous errata for it. You can receive a version for free via the PDF association. ... View more

Please remember that the PDF32000 file is derived from the ISO 32000-1 standard with different page headers. In the copyright notice you'll find:  The technical material is identical between this version and the ISO Standard; the page and sections numbers are also preserved. Requests for permission to reproduce this document for any purpose should be arranged with ISO. Thus, this file has been published with specific objectives (identical technical material on the same pages and in the same sections). To motivate people to keep it this way, permissions have been limited. Also please consider the second sentence of the quote - I'd assume that translating the document into other languages is a way to reproduce the document, so before starting the translation you should contact ISO to ask for permission and for restrictions your translation will be subject to. ... View more

I started analyzing the issue. There are some minor issues in the file, but I couldn't clearly reduce the issue to then.  Merely, when removing the revision with the last signature and applying a new one with some signing software I have here, the issue does not occur anymore. Thus, the issue is clearly rooted in that final file revision. But it can be anything, some property of the signature itself or some structure element completely unrelated to the actual signature in that revision. I'll take another look next year. ... View more

This may also indicate an issue of the PDF itself, making Acrobat to repair that issue in memory and so changing the signed data.  I'm only on a smart phone now and, therefore, cannot analyze the file. I'll take a look later this week. ... View more

The blue color can be in the PDF or can be generated by a viewer. Or both. As you neither share the PDF in question not name the other software, it is unclear which is the case.  But most common is indeed that the PDF does not use the blue color but a viewer highlights the field using it. ... View more

Can you share the PDF for analysis? ... View more

Well, there is the Acrobat uservoice forum. I don't know, though, how seriously Adobe takes the messages there.   ... View more

Please explain more exactly which date displayed where shall be formatted differently? ... View more

Highlighting is filling the selected area with the selected color in Blend Mode "Multiply". The definition of Multiply in the PDF spec in particular explains: When working with additive colours, multiplying any colour with black produces black while multiplying with white leaves the original colour unchanged. In other words, it is expected that highlighting with white doesn't change anything.   ... View more

Can you share the original PDF in question? There are some techniques to make content difficult to change with Acrobat, maybe such a technique has been used in your case. ... View more

Please share the PDF (or a test PDF with the same issue) for analysis.  It sounds like that website that generated your form did something peculiar, but there are lots of peculiar things that may have been done... ... View more

Without analyzing the PDF itself I see two possible reasons:  The person you've emailed the PDF to has opened it in a viewer that does not support applying digital signatures. In that case the signature field may not be selectable at all, and the appearance of an empty signature field usually is blank.  When creating the form you created it for filling in and signing via the Acrobat Sign service. Those forms are a bit different from those created for use on the local computer. In particular signature fields are different. You select this form type by having the check box "This form requires signatures" checked when starting to create the form. ... View more

After signing with Acrobat Sign PDFs usually are locked and cannot be further manipulated without breaking the existing signature.  So is the Acrobat Sign signing workflow already finished and you received the final result thereof? Then you can likely not add your signature anymore. Or is the Acrobat Sign workflow still in progress and add part thereof it's now your turn to sign? Then follow the instructions you got with the notification that it's your turn. ... View more

I don't see the tag names from the right side of your screen shot (Cover, Chapter, ...) anywhere at top level in your file, only Part entries. Also you mention role mappings but the RoleMap dictionary of the structure tree of your PDF is empty.   I might overlook something here, though, so someone who knows more about tagged files should take a look. ... View more

Without the document (Word and PDF version) it's difficult to tell for sure.  But you are aware that Word files are not in general meant to keep their exact layout? Depending on particular on the target output (specific printer, converter, ...) there can be small differences in character positioning which can result in different line breaks which can change the layout considerably. ... View more

Can you share the PDF for analysis? ... View more

Chances are that there indeed is an error in the file. Different viewers react in different ways to errors in PDFs. Many try to repair them but not in the same way. So for certain broken PDFs some PDF viewers are more successful repairing the issue than others.  Nonetheless, the issue in such situations is not the viewer but the file.  Can you share an example file illustrating the issue for analysis? ... View more