Program to electronically sign PDF's?

To: "debian-user@lists.debian.org" <debian-user@lists.debian.org>
Subject: Program to electronically sign PDF's?
From: Fjfj109 <fjfj109@protonmail.com>
Date: Thu, 27 Apr 2017 17:41:00 -0400
Message-id: <[🔎] M9GtwgYaBd9yc_44gjf2XENhWcniJNnJqJd6qjmdU6uM_KWhwW1551lzvDPanXWKtLx_3AGcIjbKKb0EBMlfP0t-O0ZiDUiqAYwy2xEcsQ4=@protonmail.com>
Reply-to: Fjfj109 <fjfj109@protonmail.com>

I've tried GIMP, but the document is password protected and does not give me the option to input the password. Is there any program people know of in Debian (stable) that allows me to do this?

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