Yes, I meant that each signature covers the hole present document at
the signing moment.
To check that I use:
PdfReader reader = new PdfReader(
acroFiledsf.extractRevision( revision ) );
boolean covers =
reader.getAcroFields().signatureCoversWholeDocument( revision );
reader.close();
where revision is each signature associated revision.
Sorry for asking, but shall I sent the document here?
Best.
Emilio
On Wed, Jul 22, 2009 at 3:25 PM, Leonard Rosenthol<[email protected]> wrote:
> Sure you can.
>
> The first signature covers the original document while the second covers the
> original PLUS the additions. Assuming no other changes other than signing,
> both should be valid.
>
> If the first signature is a certifying signature, then you could potentially
> have other operations as well between signatures and they could both still be
> valid.
>
> Leonard
>
> -----Original Message-----
> From: Paulo Soares [mailto:[email protected]]
> Sent: Wednesday, July 22, 2009 2:06 PM
> To: Post all your questions about iText here
> Subject: Re: [iText-questions] How to check differences between signed
> revisions
>
> You can't have two valid signatures covering the whole document. Show us the
> PDF.
>
> Paulo
>
> ----- Original Message -----
> From: "Emilio Oca" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, July 22, 2009 6:41 PM
> Subject: [iText-questions] How to check differences between signed revisions
>
>
> Could someone explain me (or point me where to find) how to check if
> differents signatures on a document where made over differents
> contents?
> I am trying to check if a document containing acrofields signed for
> first time where later modified when signed again.
> Both signatures seems to be valid and cover the hole document.
>
> Best
>
> Emilio
>
>
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