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Sign PDF with digital signature

Submitted by Hanno Meyer-Thurow @hmth

Assigned to poppler-bugs

Link to original bug (#99416)

Description

Since "support for digital signature" bug 16770 is included, how about adding support for actually signing PDF files?

For reference: LibreOffice 5.3 and newer supports signing PDF 1.5+ format[0]. I wonder if it is possible to reuse their code wrt licensing? Just in case someone is interested, may talk to LibreOffice developers.

I mailed the LibreOffice developer, but got no response (yet).

[0] http://vmiklos.hu/blog/pdf-sign.html (LibreOffice developer blog post)

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