It merely allows to detect them.Ī PDF signature contains the information which byte ranges of the PDF file are signed and (implicitly or explicitly) a hash value of the bytes in those byte ranges. In your answer you mean that Apple`s preview app can rewrite (change) the PDF? I thought that PDF is secured against changes.Ī PDF signature does not prevent changes to be applied to a document. I have even downloaded the Adobe Acrobat PRO (paid one), no luck
PDF SIGNATURE CREATION DEVICE HOW TO
I followed the solution guides how to setup the certificates but i can not make it secure. But i tried even to protect the PDF against changes after eSigning, but Adobe wont let it happen because the document is eSigned. second, when i sent the PDF (signed and protected) over an email to my self again and open it up, the protection is removed and signature shows just as picture object without saying its esignature.Īnd here is picture of PDF security preference after sending it over an email to myself againĪlso i ticked the checkbox that i want to lock the document during eSigning. first, when i view the PDF document throught ADOBE Acrobat PRO, it shows that its "signed and all signatures are valid." But when opened via standard macOS preview app, then there is no information about signature and i can even delete the signature object I have even added my digital eSignature (based on official paid certificate).
I am new to this, but i have successfully created and signed PDF document in macOS and Adobe Acrobat PRO.
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