Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1070 / 1490

Advanced Options
Opens the Advanced Options Dialog Box, where you can choose an
encryption provider and key length.
Attach Digital Signatures After Saving Drawing
Attaches a digital signature to a drawing when the drawing is saved.
Comment
Provides a place for comments about the digital signature or the files you
are signing.
Current Encryption Type
Specifies the default encryption level supplied by your operating system,
unless you choose an advanced level by clicking the Advanced Options
button.
Encrypt Drawing Properties
Encrypts drawing properties, so a password is required to view them.
Drawing properties are details that help you identify the drawing, including
title, author, subject, keywords that identify the model, or other important
information.
Get Time Stamp From
Provides a list of time servers you can use to time stamp your digital
signature.
Password or Phrase to Open This Drawing
Adds, changes, or removes a password the next time the drawing is saved.
If you add or change the password, the Confirm Password Dialog Box is
displayed. If you lose the password, it is not recoverable. Before you add a
password, you should create a backup that is not protected with a password.
Select a Digital ID (Certificate)
Displays a list of digital IDs that you can use to sign files. Includes
information about the organization or individual to whom the digital ID
was issued, the digital ID vendor who issued the digital ID, and when the
digital ID expires.
Signature Information
Provides a list of time services you can use to add a time stamp to your
digital signature, the status of the time server connection, and a Comments
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