Create digitally signed PDFs

Is there a way to create digitally signed PDFs by using the options at the "Print" menu to "Save as PDF" that is available at certain apps ?
If there is no built-in solution by Apple, which applications do you use to digitally sign PDFs ? I searched the discussions, but haven't found an appropriate solution so far...
Thanks for your help

tobias Eichner wrote:
Is PortableSigner a professional tool that really works ?
I have no idea how good it is, and I don't really have any benchmark to compare it to. It's hosted at Sourceforge, which might explain why the web site is a big crude-looking. On the other hand, the site says it's a project of the Municipality of Vienna, so I'd say that it appears it's good enough for at least one government.
My feeling is that a lot of the software at Sourceforge is written for a specific, fairly specialized purpose, and sometimes not a lot of time is spent on the GUI or user-friendly features. But if your purpose happens to meet up with the purpose of the creators, the software can be a life-saver.
Really, I'd say just download it and try it. Only you know if it's good enough or not. And you've got nothing to lose since it's free.
charlie

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