Hello
I'm having an use case where a PDF document has to be both signed and
encrypted, with only some access permissions allowed. I was unable to
find an example.
Either operation works separately. Starting with a simple PDF a valid
signed one or a valid encrypted one can be obtained. However executing
both operations on the same file fails.
When trying to do a signed/encrypted file the the procedure I use is:
- read the original PDF file doc (has no security)
- create AccessPermission with restricted permissions
- create StandardProtectionPolicy with password encryption and the above
permissions
- call doc.protect with the above policy
- create PDSignature with visual component
- call doc.addSignature
at this point:
- calling doc.saveIncremental results in document with digital
signature, encryption and correct access permissions but no visible text
- calling doc.save results in a document with encryption, correct
permissions and visible text, but the digital signature is invalid.
What are the steps that I should follow? If it is correct, do you need
any example files?
Thank you,
Bogdan
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