Digital Signature

In general digital signatures are used to authenticate the identity of a user and the document content. It stores information about the signer and the state of the document when it was signed. When enterprises distribute documents electronically, it is often important that recipients can verify:

• That the content has not been altered. (integrity)
• That the document is coming from the actual person who sent it. (authenticity)
• That an individual who has signed the document cannot deny the signature. (non-repudiation)

A PDF document may contain the following standard types of signatures: One or more document (or ordinary) signatures. These signatures are sometimes referred to as 'recipient signatures'. At most one MDP (modification detection and prevention) signature. This signature is also referred to as an 'author' or 'certifying' signature.

Essential PDF provides support for both types of signatures.

Here is the screenshot of Standard signature.

Here is the screenshot of Certify signature.