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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (PDFBOX-3853) Invisible sigaure's catalog tree is not updated
Date Mon, 03 Jul 2017 21:06:02 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-3853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072918#comment-16072918
] 

Tilman Hausherr edited comment on PDFBOX-3853 at 7/3/17 9:05 PM:
-----------------------------------------------------------------

I'm very reluctant to change that part again... I removed the annotation in PDFBOX-3114 to
simplify things. The text you quote from does not force the annotation: "may actually be described
by a widget annotation dictionary containing entries pertaining to an annotation as well as
a field". So no force to have both.

Some time ago, I checked whether a PDF/A-1b file with such an invisible signature would qualify
as PDF/A-1b, and yes, it was accepted. (by pdf-tools validator)


was (Author: tilman):
I'm very reluctant to change that part again... I removed the annotation in PDFBOX-3114 to
simplify things. The text you quote from does not force the annotation: "may actually be described
by a widget annotation dictionary containing entries pertaining to an annotation as well as
a field". So no force to have both.

> Invisible sigaure's catalog tree is not updated
> -----------------------------------------------
>
>                 Key: PDFBOX-3853
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3853
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Signing
>    Affects Versions: 2.0.6
>            Reporter: ryuukei
>            Priority: Minor
>              Labels: signature
>         Attachments: PDDocument.patch
>
>
> According latest Acrobat PDF 1.7 speficication:
> http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
> Page 695, section [Signature Fields]:
> * quote 1:
> The field type ( FT ) is Sig , and the field value
> ( V ) is a signature dictionary containing the signature and specifying various at-
> tributes of the signature field.
> * quote 2:
> Like any other field, a signature field may actually be described by a widget anno-
> tation dictionary containing entries pertaining to an annotation as well as a field
> (see “Widget Annotations” on page 640). The annotation rectangle ( Rect ) in such
> a dictionary gives the position of the field on its page. Signature fields that are not
> intended to be visible should have an annotation rectangle that has zero height
> and width.
> All in all, invisible signature also should be as a Signature Field, which is one type
of Annotation, thus the page catalog tree should be updated as well. 
> For fixing this improvement issue, in the class PDDocument.java L351~L353, instead of
terminating the process after [prepareVisibleSignature] by return, continue with later on
annotation update process would be better.  
> Personally I'm using itext-rups to analyse the pdf catalog structure, after applying
the patch, the signature present in the catalog tree pages/page/annot/sig correctly.



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