On 19-3-2012 22:08, Mojca Miklavec wrote:
On Mon, Mar 19, 2012 at 17:51, luigi scarso wrote:
I'm not sure about it, but I'm tempted to believe that digitally
signing PDFs might be one of "forbidden" functionality that requires
you to buy a licence for Acrobat.
Why ? As long it is described in the ISO standard, it can be
implemented in mkiv (easily is another question).
As I said: I'm not sure whether or not it is legal to implement it or not.
There seem to be two separate issues:
(a) creating a document that others users will be able to fill in and sign
(b) signing your own document
Martin usually knows the legal issues better. I'm not sure about the
exact legal state and I'm not sure where to check it without getting
lost in "hundreds" of pages of EULA or other documents, but (b) is
described in PDF Reference Manual
(http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/PDF32000_2008.pdf)
in Chapter 12 and cannot be any more complicated to implement than all
other PDF features that Hans, Taco or Hartmut ever implemented.
sure, it's just that I never needed something like that
Out of curiosity: is inability to create password-protected PDF files
with pdfTeX/LuaTeX due to legal issues or due to nobody caring enough
to implement it?
it's not worth the trouble. Afaik it's a second pass issue and would
complicate the code much.
Just use qpdf to do it ... pretty fast.
Hans
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