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random #Linux Tip:
if you have to sign digitally many #PDF documents, then follow the next steps:
1. create a new certificate with #certutil command:
certutil -S -s "CN=[ your full name ],O= [ Business or School ],OU=[ Deparment or position ],L= [ Location ],ST=[ State ],C= [ Country code ],E= [ your email ]" -g 2048 -d sql:$HOME/.pki/nssdb -n [ new name of certificate ] -x -t "Cu,Cu,Cu" -p 405-555-5555 --email [ your email ] -m 1234
2. List the created certificate:
certutil -d sql:$HOME/.pki/nssdb -L
3. Use #Okular and go to: Settings > configure backends > PDF
4. In the section: Certificate database, choose Custom and enter this path: $HOME/.pki/nssdb
5. Apply and Restart Okular, and then you'd see the available certificate in the option of step 4 to sign digitally.