2012/3/20 Mojca Miklavec <[email protected]>:
> If qpdf exists it is probably not a legal issue to do password protection 
> then.

Of course.

> But from the same perspective ... one first needs PDF to be (almost)
> finished before being able to sign it. One needs to read as-good-as
> the whole PDF, read the certificate from somewhere on the disk and
> then sign with that certificate. If certificate is password-protected,
> one also needs to provide the password somehow.

You can technically sign only parts (IIRC streams) of a PDF.

> government. On the other hand they could just as well have used some
> standard tool and it would work out of the box. So much about signing
> ...

gpg is free. So is jpdfsign.
See also http://wiki.cacert.org/PdfSigning

Best
   Martin
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