It’s not technically possible to sign an encrypted PDF – because there is no
way to encrypt the new update section with the same key as the previous
sections – unless you know what it is (and then it’s a bit tricky still).
Better to simply create a new PDF with the encrypted PDF as an attachment as
part of a collection and then sign the new PDF.
Leonard
On 8/1/17, 11:27 AM, "zyx" <z...@litepdf.cz> wrote:
On Tue, 2017-08-01 at 16:38 +0200, F. E. wrote:
> As a side note, I noticed that I cannot use load-for-update in this
> case, because the resulting pdf has an unknown password protection.
> Neither my specified user nor owner password work for decryption.
> That's odd and mighht be a bug, don't know ...
Hi,
load for update (and using WriteUpdate()) means that you keep the file
as is and only add your changes at the end. Having new values encrypted
and old values not, or using different encryption method, or even
trying to use old encryption on the new content, doesn't sound right to
me.
Doing sign & encrypt at the same time sounds the way to go, as you
figured out yourself.
Bye,
zyx
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