Digital Signature
Cryptographic signature proving integrity and signer authenticity.
Definition
Signatures can include timestamps and trust-chain checks.
Why it matters
Important for approvals and tamper evidence.
Related PDFHQ workflows
Use this concept when optimizing, converting, validating, or troubleshooting document workflows.
Related Knowledge
Cryptographic protection applied to document content and permissions.
Portable Document Format is a fixed-layout document standard designed to preserve appearance across software, operating systems, and devices.
Term used in some workflows for rights or restricted variants and references.
Framework for issuing, managing, and validating digital certificates.
Ordered trust path from signer certificate to trusted root authority.
Signature validation strategy preserving trust evidence over long periods.
Trusted time assertion proving when data existed or was signed.
Standard certificate format used in most PKI signature ecosystems.
Tools to Apply This
Combine multiple PDF files into a single document.
Reduce file size without sacrificing readability.
Split one PDF into multiple files by page range.
Add text or image watermarks to PDF documents.
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