Securing and signing PDF in C#

This section describes how to securely digitally sign PDF documents using C#. The terms electronic signature and digital signature are used interchangeably, but essentially the two are different. More generally, a digital signature comes with a certification authority approved seal and is used to protect the signed document from tampering. Instead, an electronic signature is often used to demonstrate the intention to sign a document.

• Digitally sign PDF file
• Set Privileges, Encrypt and Decrypt PDF File{:target="_blank"}
• Extract Image and Signature Information
• Sign PDF Document From Smart Card