Comparing Versions of Certified PDFs

We have an application that stores PDF documents in Oracle in a BLOB column. The documents get a certifying signature before they are first added to the database. They then get pulled out and displayed to the user in an embedded Acrobat 7 or 9 Control in a C# application. In there the user signs a Signature field and the database is Updated with the new version. There can be several users who each sign the document in turn in preconfigured Signature Fields. There is a securtiy issue since the link between the front end application and the database is a WebService, so the public Update method on the web service could be used to change a PDF to something completely different thus invalidating the supposedly secure storage.
So my question is, is there any way to compare pdfs in code (Javascript or ActiveX) and can it be done to ignore modified Signature fields?
If we could do that we could confirm that the document is "the same" as the original before doing the update.
Thanks for any advice.

No way... Normally I do a download for the scirpt or lsmw into a sequential file.
Script can be downloaded using RSTXSCRP.
LSMW have export option.
The download is done from both the system and you could use any external file comparision tools like <b>ExamDiff</b> which is freely available in net. You can find this exe with the above keyword in google.
I felt this a better way for comparision.
Cheers,
Thomas.

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As Dov says, it's very likely that what they actually mean is a PDF/X file - some flavors of which you can make from InDesign using the Export > PDF (Print) dialog presets, and some you can make using Acrobat Pro.
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I'm using iBooks on Mavericks, primarily prior to syncing books to my iPad.
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I think I've solved my problem, but it wasn't obvious. I deleted the old PDF version of the book, and I'm not sure where it went. Only when I was in the "All Books" view and I filtered by part of the book name did it appear, and it becamse obvious that the old version was still in iBooks, and I realized that deleting the old version of the PDF is a two step process, unless you delete it directly from the All Books View, when the Delete option becomes Delete from Library.
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update your adobe reader here, http://get.adobe.com/reader/
untick unwanted tag-along ware.

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I Have upgraded to the latest version available in the App Store so why am I still getting this message when I try to open up PDFs?
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Hi,
It sounds like you have a special type of form called a "dynamic XFA form".
Currently, Adobe Reader mobile products (Reader for iOS, Android, Windows Phone) do not support dynamic XFA forms that are authored with Adobe LiveCycle Designer.
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Please use the desktop version of Adobe Reader on a Windows or Mac computer to view and fill out XFA forms.
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If the PDF is the same one from the link in your post here:
http://forums.adobe.com/thread/1174643
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Hi !
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Comparing Versions of Certified PDFs

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