Unable to lock document after last signature

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   Hello everyone, first time I'm posting something on this forum. Me and my colleagues have been dealing with an issue with the QuickPDF library and have tried getting support from Foxit, but without get a response. So I figured trying the forum.
I've already looked on the forum if the following question has been asked previously, but no success so far (could only find http://www.quickpdf.org/forum/how-to-lock-pdf-with-digital-signature_topic3914.html?KW=lock but not exactly what I'm looking for). 
We use QuickPDF to generate pdf's with fillable fields, which are filled out in Adobe Acrobat and at the end signed for approval with digital signatures. We expect the documents to be locked after the last signature. Normally with Adobe Acrobat the last person to sign gets the "Lock Document After Signing" option.

With the PDF's generated by the QuickPDF library, this is not the case. For some reason Adobe Acrobat doesn't trust these.

When clicking "Review" it gives a number of Report Codes, basically claiming that the document is not trustworthy.

I've tried to figure out what bugs Adobe Acrobat with the QuickPDF's, going so far as to strip down the PDF to the bare minimum (removing all fillable fields etc) but still it refuses to lock the document.

At some point I tried to simply enable the "lock all fields" option in the signature field itself, as a work around, but this doesn't work either! I get an error message that the document cannot be signed.

Has anyone else also seen this issue?

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mvastenholt Members Profile Find Members Posts Beginner Joined: 01 Jun 21 Location: Netherlands Status: Offline Points: 5	Post Options Post Reply Quote mvastenholt Report Post Thanks(0) Quote Reply Topic: Unable to lock document after last signature Posted: 01 Jun 21 at 8:51AM
	Hello everyone, first time I'm posting something on this forum. Me and my colleagues have been dealing with an issue with the QuickPDF library and have tried getting support from Foxit, but without get a response. So I figured trying the forum. I've already looked on the forum if the following question has been asked previously, but no success so far (could only find http://www.quickpdf.org/forum/how-to-lock-pdf-with-digital-signature_topic3914.html?KW=lock but not exactly what I'm looking for). We use QuickPDF to generate pdf's with fillable fields, which are filled out in Adobe Acrobat and at the end signed for approval with digital signatures. We expect the documents to be locked after the last signature. Normally with Adobe Acrobat the last person to sign gets the "Lock Document After Signing" option. With the PDF's generated by the QuickPDF library, this is not the case. For some reason Adobe Acrobat doesn't trust these. When clicking "Review" it gives a number of Report Codes, basically claiming that the document is not trustworthy. I've tried to figure out what bugs Adobe Acrobat with the QuickPDF's, going so far as to strip down the PDF to the bare minimum (removing all fillable fields etc) but still it refuses to lock the document. At some point I tried to simply enable the "lock all fields" option in the signature field itself, as a work around, but this doesn't work either! I get an error message that the document cannot be signed. Has anyone else also seen this issue?

mvastenholt Members Profile Find Members Posts Beginner Joined: 01 Jun 21 Location: Netherlands Status: Offline Points: 5	Post Options Post Reply Quote mvastenholt Report Post Thanks(0) Quote Reply Posted: 01 Jun 21 at 8:54AM
	One extra note: I tried to copy paste images of the digital signing process in my post but I was getting errors (apparently the forum doesn't like attachments of images?) so I hope my explanation is somewhat clear. The "Report Codes" that I mentioned in my post are things like: 4000 Unrecognized PDF Content 2007 Page content may silently change 4000 Unrecognized PDF Content 1001 Comment of form field may silently change 1002 Comment of form field may silently change 1008 Document contains hidden behavior And even if I remove all fillable fields and other content from the PDF (via the Form option in Adobe Acrobat) it doesn't make any difference.

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 03 Jun 21 at 8:46PM
	Hi Menno, perhpas these two articles from Debenu/Foxit will give you an idea what's wrong: https://www.debenu.com/kb/advanced-options-signing-pdf-files/ https://www.debenu.com/kb/add-visual-digital-signature-to-a-pdf-programmatically/ BTW: If you use LastErrorCode directly after a QuickPDF-call then you can check if something went wrong. Cheers and welcome here, Ingo
	Cheers, Ingo