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Further reading: How to sign PDF documents without printing them out Digital signing, important differences With digital signing, not all signatures are the same. There are three basic options ...
Some of the best Adobe Acrobat alternatives we really like with a host of professional tools include Nitro PDF Pro, EaseUS, ...
If a signature is not validated in a PDF, we see Validity unknown with a question mark. You need to validate the signature to make it valid.