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Adding another digital signature to pdf makes the old signature invalid.

Thread ID:





144450 May 7,2019 10:21 AM UTC May 9,2019 11:20 AM UTC ASP.NET MVC - EJ 2 3
Tags: PDF
Asked On May 7, 2019 10:21 AM UTC

I successfully manage to digitally sign pdf document using external hash. (https://www.syncfusion.com/forums/142454/how-to-add-signed-hash-to-pdf-as-signature)
but then if I try to add another signature to the document the old signature become invalid.
can you help with that?

Attachment: Outputsigned_31ce9f77.rar

Surya Kumar [Syncfusion]
Replied On May 8, 2019 01:21 PM UTC

Hi Ahmad, 

Thank you for contacting Syncfusion support. 

We have created a sample for your requirement, please try the same and let us know if the provided solution work from your side. 

Note: The issue which you have mentioned may also occur if there is trial version watermark applied to every PDF which you have created. So please make sure you are using the licensed version assemblies and there is no watermark added to PDF 

Surya Kumar 

Replied On May 9, 2019 08:42 AM UTC

Yes I still working on trial version of Syncfusion. And I don't add any watermark to pdf. do you? 
also will this be fixed after I moved to licensed version?

Sowmiya Loganathan [Syncfusion]
Replied On May 9, 2019 11:20 AM UTC

Hi Ahmad, 

If you are using the trial version of Syncfusion, it will add watermark to every PDF document which you have created. So the reported issue “Signature becomes invalid” may occurs due to this. This issue will be fixed once you moved to licensed version. Please let us know if you have any concerns on this. 

Sowmiya L 


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