Maintaining digital signatures in single pdf

Is there a way in Acrobat 9 Pro to maintain digital signatures when combining multiple files into a single pdf? For instance, if I sign my timecard and a separate expense report, then my supervisor also countersigns both documents, I lose the signatures when combining the timecard and expense report into a single file. I believe the signatures are maintained when creating a portfolio, but can it also be accomplished in a single pdf?

I tried combining mulitple pdf documents either signed by me and/or a customer into one pdf document and the signatures were lost. However, if you combine them as a 'PDF Portfolio' instead of 'Single PDF' you'll maintain the signatures. The option is located in the right corner of the 'Combine Files' screen.

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Digital signatures and combining PDFs in Acrobat X

I hope that one of you Acrobat gurus can help me out with one or more of these questions:
Is it possible to maintain digital signatures when inserting signed PDFs into another PDF?
Is it possible to remove a digital signature after a signature has been deleted from the page?
Is it possible to change the format of the date and time on a digital signature?

In the simplest sense a digital signature is a special checksum of all the bytes in the bytes in the PDF combined with all the bytes in the digital signature. If the document is changed in any way the checksum changes, so the signature becomes invalid. A valid signature ensures that the document hasn't changed since the signature was applied. That stuff that's shown on the signature field is irrelevant. It's just a pretty picture. The real stuff is going on inside the PDF where you can't see it.
Obviously it gets a lot more complext then this. The signature can be selectively applied so that the certain types of changes are allowed. A signature does not add real protection to a PDF, but Acrobat plays along with this scheme by trying to not allow changes that would invalidate the signature, and logging all modifications to the PDF.
1) There are ways to maintain the visual appearance of the signature on the page. If the permissions have been set to allow it the PDF can be flattened, which also partially removes much of the stuff that's going on internally. But this isn't always possible. I had to solve this problem once for a client, so I wrote a plug-in that strips the signature permissions from the PDF (I'll post this to www.pdfscripting.com sometime soon), after which the the PDF can be flattened, keeping the appearance. But of course, after this point the document has to be considered invalid. For example, if the document was a contract, the flattened version would be good for use in an analysis of say all contracts for a particular year, or for copying legal language to another contract, but it couldn't be used as the basis of a legal dispute.
2) I don't understand this one. Do you mean you're deleting the signature field and some of the internal digital signature stuff is still hanging around causing problems? If you own the signature (or the permissions allow), then a standard form reset will "Un-Sign" the PDF. Inserting PDF pages into another PDF will strip out all this info as well.
3) The stamp appearance is set at the time the stamp is applied, it cannot be changed after this point. It's a lot like a PDF stamp.
Thom Parker
The source for PDF Scripting Info
pdfscripting.com
The Acrobat JavaScript Reference, Use it Early and Often
http://www.adobe.com/devnet/acrobat/javascript.html
Then most important JavaScript Development tool in Acrobat
The Console Window (Video tutorial)
The Console Window(article)

Save metadata per digital signature field in PDF?

Hi All,
I'm looking for a way to save metadata per digital signature field in a PDF.
For example for each signature I would like to save additional string property.
Can I use XMP in this case?
Thanks in Advance!

Hi,
Yes, we have options to add digital signature to the pdf. We have one attribute called "Permissions" in "cfpdf" tag. If we provide permissions = 'AllowSecure', then system would allow digital signature for that pdf.
Please go though the docs for details info. I will post in details next.
Thanks
Chandrakant

Multiple Digital Signatures on single profile.

Hello,
I have a question. Can I create multiple digital signatures on a single system.
If Yes, I can create digital signature of any "Signature required person" and I can sign for him, If I have his email id and Organization name, correct?
It means we can easily sign for any other person in the world. If so, how does this system mean to be safe ?
Thanks

Please repost this issue in Acrobat forum.This is reader forum.

Multiple digital signatures in a pdf form?

I'm creating an adobe pdf form that requires multiple approvers (one after the other) to digitally sign the form. However, once the second person digitally signs the form, the first person's signature will become invalid because the addition of the second signature is not signed by the first person.
Is it possible to digitally sign the pdf form excluding the signatures? and how to allow multiple signature in a pdf form while ensuring the form integrity?

Hi,
I doubt that the addition of a second signature actually invalidates (the red X icon) the first signature, but rather it shows the signature as Valid with Changes (the pen & yellow triangle icon). Technically, that is the correct signature status, but because it caused so much confusion, beginning with version 9, we've changed the user interface and stopped indicating changes to the PDF if the only change is a subsequent signature.
If on the other hand you are getting the red X for the first signature please let me know as I'd be curious to see the file.
Steve

Using Digital Signatures in a PDF File | Acrobat X | Adobe TV

This video details how to use the new Sign & Certify panel for digital signatures, including the new Time Stamp Document tool, in Acrobat X Std. and Pro.
http://adobe.ly/yDHBdn

I wanted to add a scanned pdf signature to a W-9 form, and I changed the preference in Security as you suggested, but the new icon in the top tool bar is grayed out, as are all the choices within the Sign & Certify drop down. I watched movies, and looked at forums, and no one has this grayed-out issue. I have been trying to figure this out for an hour, and everything I find is a dead end.

Transfer attachments and Digital Signatures,from a PDF, to Interactive Form

Hi,
I am developing an an application in WebDynpro Java.
I have a requirement that a user A creates a new interactive form & fills some of the details, & then saves the form.
User B then fetches the form & fills the remaining details.
User A can add attachments & digitally sign the form(using digital signatures).
When user A saves the form, the application saves it in the JDT. The application fetches the pdf from the JDT & shows it to the user B.
The problem is that, when the form is displayed to user B, i need to pass a variable(using context nodes) to the form, so that some of the properties(visibility,read-only,etc) of the UI elements(of the form) changes, depending on the variables' value.
For this purpose, i need to use the Form for user B in ""UpdateDataInPdf" mode.
But if i do this, then all the attachments, signatures saved in the pdf form(by user A), do not get transfered to the Interactive Form of User B!!
How do i overcome this problem??
I am using NW7.0 SP13.; Designer7.1, xACF is installed.

Hi everyone,
I solved this issue using the transferPDFDataIntoContext of the WDInteractiveFormHelper class.
The AIF mode must be set to usePdf.
I hope it will be useful.
Regards,
Mirco

Digital signature on exported PDF

Hello everyone,
A customer of ours is asking for the possibility to have PDF's, which are being generated by the BO XI scheduler, signed with a digital signature.
Does anybody know if this can be easily done ?
Does it require additional programming, or can we just install a (Acrobat) plugin ?
Thanks for any idea you might give !
Cheers !
Bruno.

Hi, Use C# to create signature on PDF. You can refer to my link http://www.e-iceblue.com/Knowledgebase/Spire.PDF/Program-Guide/How-to-Create-PDF-Digital-S ignature.html

"Save As" requested instead of "Save" after digital signature of my PDF

Hi all,
I use Adobe Reader XI.
I have a PDF file configured with a set of fields to be filled in.
One of these fields is a digital signature field.
Everyting is working fine: I can fill the fields and sign the document with my ID card, as you can see below :
The problem I have is that when I sign my document with my digital signature, Adobe request a "Save As". I would like to know if there is a way to only use a "Save" ?
That requirement is very important since we will deploy the solution to more than 5000 users in an environment which is integrated with other tools, and for the whole stuff to work, the users can't change the file name nor file path... In that scenario, you will understand that proposing a "Save As" by default is not the good way to go.
Ciould you please tell me if a solution exists for this ?
Thanks already
Benoît

Never mind, I found the answer.
A matter of setting the Firefox options so that PDF files open in Reader or whatnot rather than prompt to save.

Click for digital signature without Save PDF?

Previous versions of interactive/fillable PDFs didn't require the document to be saved once the user clicked to digitally sign. We've rendered some new PDFs with Acrobat X Pro that have a digital signature and it is requiring the user to save the file. This poses a challenge because some of these PDFs may be used on a tablet or iPad by a sales representative that is trying to collect a signature but needs to continue filling out the form beyond what the purchaser of services/products is agreeing to above that signature. There will also be other signature areas throughout the document. We are looking to simply add the signature stamp and continue to add fillable content and additional signature stamps throughout the document until it is complete to be saved.
Is there a way around this or is it a new security issue with Acrobat X causing this? Previously we were designing with Live Cycle Designer and had Acrobat 9 installed. One last thing, the sales guys will have Reader and not Pro installed on those tablet devices. Any thoughts or direction that could be provided is greatly appreciated.

I recommend that you use stamps, not signature fields. They are not the same thing.
You can add as many stamps to a document as you wish, without having to save along the way, but signatures are meant to be applied at the end, after the form is completed.
You can even design your own stamps and make them dynamic, meaning they add things like the user name and current date, etc.
Have a look at: http://www.pdfscripting.com/public/department53.cfm

How to format the text in a Digital Signature for a PDF in landscape orientation?

I have a custom Digital Signature plug-in which prompts the user to enter few details on a dialog and then renders the signature. Now, the problem is for a page which has PDPageGetRotate value as 90. In this case, the entire content(text) in the signature is rendered reversed i.e its displayed upside down. However, for a page in portrait mode, i.e with rotation value as 0, signature is correctly displayed.
Can anybody help me by explaining which callback/method to use to frame the text appearance? I think there needs to be some change in the parameters passed to DigSigAPCreateLayeredStreamEx, am i correct?
Let me know any comments/suggestions on this issue of correctly rendering text in a digital signature for a rotated page.

Just setup the appropriate transformation matrix.

Multiple Digital Signatures on one PDF file

I have been trying to establish a means of allocating multiple signatures against one PDF file so as to have several people approve a issued document or documents. When ever I try it I find that the latest approval makes the previous one obsolete. I expect there is a simple solution to the problem.

The only thing I've found is the 3rd party program solution. CoSign is the name of the product I see most often referenced. Mind you, I am looking on behalf of my users/customers who have documents with multiple signatures they've saved inthe past, but cannot do it today. It appears that either Microsoft (these are Excel and Word documents they are referring to) produced a security update that changed this, or a 3rd party program is no longer effectively working.
For reference, I've been actively searching the internet for days for an answer - unfortunately, I've only found 3rd party programs referenced. Which I could have been more help.

Multiple e- signatures on single PDF

Hi All - We have a requirement that a document can be uploaded from Web-center portal application and request e-signatures from multiple recipients .
Displaying the single water mark e-signature at the end of each page is possible ,
but how can we manage in-case of multiple signatures ,is there any feasible solution to satisfy this requirement .
appreciate your feedback and thanks in advance .
Thanks
Sreeni

[Disclosure: I work for CoSign]
Yes, your needs are covered by the CoSign Connector for Oracle WebCenter Content. It uses the CoSign signing system (either on-premises or cloud) to securely sign pdf or other documents.
The signing process can be controlled by Oracle workflows. A document can be signed multiple times. The resulting signed pdf document and its signatures can be viewed using the free Adobe Reader or by other apps. Adobe Reader (or other apps) can verify the signatures to assure the viewer of the signers' identity, intent and to verify the document's integrity (ensure that the document was not changed since signing.)
More info via sales at arx.com. Tell them Larry Kluger sent you.

Digital Signatures in Adobe PDF with Adobe SDK

Hi,
Please, apologyze my poor english.
I have an application that inserts a signature programmatically in a PDF document with Acrobat 8, via VB .NET, using the example provided in the Acrobat 8 SDK ("AddSignature").
The difference between the SDK example and this code resides only in the way of calling the script in .net
I call directly the AddSignature function with this code (partial), instead of calling the execution of the "ADBESDK:AddSignature" menu (this improves faster execution with no AVDOC object involved):
        AcroExchPDDoc = New Acrobat.AcroPDDoc
        Dim JsObj As New Object
        AcroExchPDDoc.Open("c:\test.pdf")
        JsObj = AcroExchPDDoc.GetJSObject
        JsObj.SetUserDigitalIDPath("/C/trabajo/DrTest.pfx")
        JsObj.SetUserPassword("testpassword")
        JsObj.AddSignature(JsObj)
        JsOb = Nothing
        AcroExchPDDoc.Save(1, "c:\result_test.pdf")
        AcroExchPDDoc.Close()
I notice that the more signatures the PDF already contains at the time of inserting a new signature, the more is the time it cost to the program to execute the "AddSignature" line. I've configurated Adobe Acrobat to not validate signatures on open, so I guess validation of existing signatures is not the cause of this delay.
Can someone tell me something about this ??

Well, surely a larer filesize could be the cause of incresing time but, in this particular case we are talking of PDFs about 150kb each.
With 3 or 4 signatures already, they have about 180kb so i guess the increase in filesize can´t be the origin (especially with a PC above the average). Anyway, i´m not sure...
Does someone have any other idea about this?

Digital signature in a PDF document

Hello,
I'm trying to make a BSP that signs a pdf document. I've seen the BSP SSFDEMODIGSIG but It only makes a encoded file with the PDF and the sign. What I need is to create a PDF document digitally signed. Is it possible to do it?. Thanks for your help

/people/sap.user72/blog/2004/11/10/bsphowto-generate-pdf-output-from-a-bsp
That's the weblog where we all got together and came up with the solutions to create dynamic PDF files.
Perhaps that will help you out.

Maintaining digital signatures in single pdf

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