PAdES
PAdES (PDF Advanced Electronic Signatures) is a standard defined by ETSI (EN 319 100 series) that specifies how electronic signatures conforming to eIDAS should be created and embedded within PDF documents.
What it means
PAdES builds on the PDF signature specification to add requirements for long-term validity, including embedding revocation information (OCSP responses or CRLs) and trusted timestamps within the signature. There are several conformance levels: PAdES-B (basic), PAdES-T (with timestamp), PAdES-LT (with revocation data), and PAdES-LTA (with long-term archival properties). Higher levels maintain verifiability after certificates expire.
Why it matters for e-signatures
SignOwl produces PAdES-compliant PDFs for advanced signature workflows, ensuring that your signed documents can be verified decades from now — even after the signing certificates have expired — which is essential for long-term contracts and regulated industries.
Related terms
Frequently asked questions
What is the difference between PAdES and a standard PDF signature?
A standard PDF signature uses the basic ISO 32000 signature format. PAdES adds eIDAS-required elements like qualified timestamps, embedded revocation data, and archival timestamps for long-term verifiability.
Which PAdES level should I use for contracts?
PAdES-LT or PAdES-LTA is recommended for contracts with long retention requirements. PAdES-LTA includes periodic archival timestamps that ensure the signature remains verifiable indefinitely.
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