Signature types

You can apply different types of signatures based on the intent. There are two types of signatures you can apply to PDF files, depending on the intent of the signer and the author. You can have approval signatures, certification signatures, or both on your document.

• Approval signature. An approval signature is a digital signature which indicates your approval. You can use digital signatures to sign a PDF file multiple times and by different persons.

• Certification signature. A certification signature must be the first signature applied to a document. You can no longer certify the document once there is an existing certification signature. You can also restrict the types of changes other people can make to the document.