Guides
How electronic signatures work, what a signed PDF proves and how to check one. Each guide answers its question in the first paragraph.
- “Signature validity is unknown” in Adobe: what it means and how to fix itWhy Adobe says a signature's validity is unknown, how to tell an untrusted certificate from a changed file, and how to fix it for a SignClearly PDF.Read the guide
- SES vs AES vs QES: the three levels of electronic signatureWhat SES, AES and QES mean under eIDAS, with article references, a comparison table, how to choose a level, and which levels SignClearly provides.Read the guide
- How to send a PDF for signatureUpload a PDF, place the signature, date and name fields, set the recipient and link duration, and send. What the signer sees and what you get back.Read the guide
- E-signature audit trail: what it records and what it provesWhat an e-signature audit trail is, what SignClearly records for each document, how the hash chain works, and what the log can and cannot prove.Read the guide
- Electronic vs digital signature: how they differAn electronic signature is a legal concept, a digital signature is a cryptographic technique. How they differ and how one signed PDF can carry both.Read the guide
- Check a signed PDFHow to check a PDF signed with SignClearly in Adobe Acrobat or Reader, and how to make Adobe trust the SignClearly root certificate.Read the guide