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Digital signatures

On Windows

I cannot place an electronic signature. What should I do?
How do I digitally sign a document with Acrobat Reader DC?
My digital signature is invalid. What should I do?
The validity of my signature is unknown. What should I do?

On Mac

I cannot place an electronic signature. What should I do?
My digital signature is invalid. What should I do?
The validity of my signature is unknown. What should I do?
How do I set a digital signature with Acrobat Reader DC?
How do I digitally sign a document with Acrobat Reader DC?

On Linux

How do I electronically sign a document in Acrobat Reader DC?
How can I configure Libreoffice to sign documents with the eID?
How can I sign documents with Libreoffice?
How can I sign existing PDF files in Libreoffice?
How can I sign PDF files with a timestamp in Libreoffice?