PdfBox : to sign pdf embeded in an opensource ECM solution ?

[Philippe Briere <Ph...@smile.fr>]

Hi,

PdfBox can encrypt/decrypt, can I use it to simply sign a PDF desktop-side ?

Thanks

Philippe

Re: PdfBox : to sign pdf embeded in an opensource ECM solution ?

[Ad...@swmc.com]

What do you mean by "sign a PDF"?

You can use it to set an owner-password and set the permissions to 
disallow editing.  But, as even Adobe warns, setting the permissions are 
merely a suggestion; it's still possible to do all the things that you 
disallow via the permissions.  So this isn't a good way to prove that a 
document is unmodified from the author.

If your goal is to ensure that the PDF is not a modified version of the 
original, I'd suggest generating a SHA1 hash of the file and posting that 
publicly.  You could also use public key encryption (i.e. GPG, PGP, etc.) 
to sign it to give people more assurance that it was really you who posted 
that SHA1 hash.

Hope that helps,
Adam



From:
Philippe Briere <Ph...@smile.fr>
To:
"pdfbox-users@incubator.apache.org" <pd...@incubator.apache.org>
Date:
11/10/2009 06:10
Subject:
PdfBox : to sign pdf embeded in an opensource ECM  solution ?



Hi,

PdfBox can encrypt/decrypt, can I use it to simply sign a PDF desktop-side 
?

Thanks

Philippe



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