> Oh, you only care about the field values? You don’t care about any other
> potential changes to the document??
Yes, by now.
But I'm looking into check the hole document. Can I compare a hole
revision without fiddling with low level objects?
> Also, please note that you are have (in this case) an XFA-based form, which
> means you may want to use the native XFA information for change detection
> INSTEAD OF the “AcroForm mirror”...
Yes I feel I dont know enough on XFA-based forms I will look some
documentoation on it.
Thanks
Emilio
>
> Leonard
>
>
> On 7/23/09 3:06 PM, "Emilio Oca" <[email protected]> wrote:
>
> Leonard,
>
> But I actually changed just one of them. Seems to be that the other
> tree count as modified too.
> Of course is valid, signatures are still valid. But in my workflow I
> need to know if all signatures are over the same values.
>
> So, I was facing to look at each significant field in every revision
> and check they value the same. I think I am able to do that. Unless I
> am doing this wrong and there is a better way you can suggest me.
>
> Thanks you very much.
>
> Emilio
>
> On Thu, Jul 23, 2009 at 3:38 PM, Leonard Rosenthol<[email protected]>
> wrote:
>> Actually FOUR fields were modified between the revisions (according to
>> Acrobat 9's modification list).
>>
>> And under what criteria do you consider it "spoiled"? Under many
>> workflows, it is perfectly valid, since the second signature "resigned" the
>> original plus the changes.
>>
>> However, if you wish to determine what has changed between revisions you
>> need to look at the LOW LEVEL OBJECTS in the PDF file to see what objects
>> exist in the update table and whether they are significant to you or not.
>>
>> Leonard
>>
>>
>> -----Original Message-----
>> From: Emilio Oca [mailto:[email protected]]
>> Sent: Thursday, July 23, 2009 12:18 PM
>> To: Post all your questions about iText here
>> Subject: Re: [iText-questions] How to check differences between signed
>> revisions
>>
>> Hi,
>>
>> Attached is a pdf with two signatures.
>> One of the fields had it's contents modified between the first and the
>> second signing How can I get to know and reject this as a spoiled document?
>> Shall I get each revision and check every signed field? Can you enlighten
>> me how?
>>
>> Best.
>>
>> Emilio
>>
>> On Wed, Jul 22, 2009 at 3:43 PM, Emilio Oca<[email protected]> wrote:
>>> 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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>>
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