This blog post describes the case where your application asks Chilkat to produce an LTV-enabled PDF signature by specifying “ltvOcsp” in the signing attributes, yet the signed PDF as viewed in Adobe Acrobat does not show the signature as being LTV enabled. For example, in Adobe Acrobat, an LTV enabled signature looks like this: You can see the message “Signature […]
Question: I need to sign a PDF with a certificate and a signed hash returned from a 3rd party. Answer: It’s possible, and it’s a feature that was introduced in the latest version of Chilkat (v9.5.0.96). However, it requires a well-defined REST API (or something similar) where Chilkat can make the REST API call from within the PDF signing process. […]
Open a PDF in Adobe Acrobat DC. Then without doing anything else, close the PDF. Does Acrobat ask to save changes even though you made no changes? If so, then it means that Acrobat auto-fixed a corrupt PDF.