Digital Signature Components

A digital signature has the following components:

An element (a cell) stored in the file	.
Special linkage containing	Hash of model or file and optionally its references Signer's certificate Time of signing Optional information, such as expiration, annotation data, signature graphics, or list of prerequisite signatures
“Signature cells”	A signature cell is really just a cell. It is created and managed as a normal cell in a cell library. It is then placed in the model that is being signed. What makes a signature cell special is that it itself is digitally signed