ClickTools
menu Options.At the Command prompt, enter
options.
In the Options dialog box, Open and Save tab, click Security
Options.
In the Security Options dialog box, Password tab, enter a
password.
To encrypt drawing properties, such as the title, author,
subject, and keywords, click Encrypt Drawing Properties.
Click OK.
In the Confirm Password dialog box, enter the password you
used. Click OK.
WarningIf you
lose a password, it is not recoverable. Before you add a password
to a drawing, you should create a backup that is not protected with
a password.