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Digital certificate - Document changes and Signing time

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PdfProcessing
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Inelcis
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Inelcis asked on 11 Sep 2018, 12:06 PM

Hello,

 

We have been trying to use create a service for automatic document signing.

Right now we have two problems:

1) When you sign a document through acrobat, it gives you an option of locking the document. If you do this, on the signature properties you can read something like: "The certifier has specified that no changes are allowed to be made to this document."

Do we have access to any variable that grants control over this behaviour?

2) When signing a pdf with a digital certificate, the signing time includes the time zone for example: "2018/09/11 12:07:20 + 01'00'". Is there any way to retrieve the same format so we can put it on the appearance? (If we just use the signatureField.Signature.Properties.TimeOfSigning.toString(), it does not include the timezone)

 

I'll be willing to supply any other code necessary.

Thank you in advance.

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Tanya
Telerik team
answered on 14 Sep 2018, 11:51 AM
Hi,

1) About the locking functionality, do you mean the one that locks the fields in the document? Would it be possible to share a sample document containing this feature?

2) The time of signing is preserved as a DateTime object. This type doesn't preserve information about the time zone and I am afraid that I cannot suggest you an approach to obtain it. I logged a request on our portal, which you can use to vote for an implementation and subscribe to track the status of the task.

Regards,
Tanya
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Inelcis
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answered on 14 Sep 2018, 05:32 PM

Hi Tanya,

 

1) I have attached two pdfs, one of them signed with the locking functionality and the other one signed without locking. I have also attached screenshots of the process followed to sign and lock a pdf using Adobe Acrobat Reader DC Version 2018.011.20058.

2) Thank you. I have upvoted the request.

 

(Since i cannot attach PDF's, i have uploaded everything to a file sharing service: https://files.fm/u/t9tt8vx4)

Thank you for all the help provided.

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Tanya
Telerik team
answered on 19 Sep 2018, 02:50 PM
Hi,

Thank you for the additional information.

I investigated the locked document and confirmed that the functionality I had in mind is the same. It is, however, not supported by PdfProcesssing and I just created a request for it. You can submit your vote for the implementation and subscribe using the item: Add support for locking the fields from editing after signing a document.

Hope this is useful.

Regards,
Tanya
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Inelcis
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answered on 20 Sep 2018, 02:51 PM

Hi Tanya,

 

Thank you for the help provided, i have upvoted both requests and will be marking the thread as answered.

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Inelcis
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