Certification vs Signature

[UnsaDev]

Is it possible to certify a PDF with SAPP, or is it only for signature ?

[dealfonso]

Sorry for my ignorance, but I am not able to "certify" a PDF document using Adobe so that I can check the workflow. How am I supposed to certify documents?

[UnsaDev]

The differences between Signing and Certifying are explained for example here
https://www.globalsign.com/en/blog/certifying-vs-approval-signatures-in-adobe

Certify is like a seal, the document can't be modified at all after.

@hidasw made the work for TCPDF, certify, LTV, and TSA. And it works perfectly for PDF created with TCPDF.

But I wanted to use your package, for all other PDF, not created with TCPDF.

[dealfonso]

@hidasw made the certification for TCPDF? could you please send a reference so that I can check if that feature can be added to sapp?

[UnsaDev]

I hope he will be able to explain how to do that.
Yes his TCPDF fork is fully operational for LTV Certification, with the setSignature() method

Only one problem with TCPDF, it's fine for PDF created with TCPDF, but we can't certify existing PDF like I need to do.

[UnsaDev]

However, I have tested your LTV signature with my trusted certificate, it works properly with some changes, because my signature length is 37934, and my extraverts if formatted with \r\n. I make a PR to take it into account.
It's not the certification I need, but good job.