Certificate-based signatures, Adobe Acrobat
Follow these steps to sign PDF files with certificate-based digital IDs. Adobe Acrobat helps you set up certificate-based signatures, use them to sign PDF files, and also validate PDF files you receive from others.
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How to Sign PDF with Digital Signature Certificate (in Adobe Acrobat Reader)
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Private PKI, Adobe Reader® Signatures
How to Create Digital Signatures with Adobe Acrobat?
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Sign a PDF with an AATL Certificate - Acrobat Reader DC :: Sign a
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