To run this sample, get started with a free trial of Apryse SDK. Learn more about our Python PDF Library and PDF Digital Signature Library. Tools -> Digitally sign… -> (asks me for Firefox’s ‘master password’ in other words) -> draw a square for signature -> select digital certificate -> name of signed file. C (Xamarin) Sample Python code to use PDFTron SDKs high-level digital signature API for digitally signing and/or certifying PDF files. In Okular: Settings -> Configure Backends -> radio tick “Custom:” and select the location where the Firefox data database with digital certificate is located (in my case it works /home/username/.mozilla/firefox/fault-esr). (( This step in case signing still doesn’t work. The drawing of a continuous line made with the freehand curve function is not satisfactory, because it creates disjointed, separated, broken lines. # flatpak run 3.) Setting up the certificate database (with personal certificate) PDF is just a necessary means of using different software that does better than Writer, otherwise I would do without it. # flatpak remote-add -if-not-exists flathub 2.) Install Okular ![]() It works for me if I install a newer Okular via Flatpak: 1.) Install flatpak ![]() I also tried building a container a little bit - unsuccessfully. If you open the file in Scribus, then copy your signature picture from wherever you store it (I keep mine in a LibreOffice. There are other programs that allow pdf editing but its the only one I could get to work for me and it certainly lets you add a signature. ![]() PDFStudio Pro: Paid PDF managing software for Windows, Mac and Linux, the main function of this program is to create and interact with PDF documents but it has the capability of digitally signing them. You can edit pdf files using Scribus (available in the software centre). Otherwise, I followed the recommendation ( ) that the most comfortable way is via flatpack ( ). After reboot, open a document, select File, select Export as, select Export as PDF. Offline software to digitally sign documents. Maybe it already works for you if you have a new enough Linux (version 21.01 of poppler). Therefore I will continue to use pyhanko. I found something that works for now, but it’s a Flatpak container and containers are apparently not very safe.
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