Click File menu Save
As.At the command prompt,
enter saveas.
In the Save Drawing
As dialog box, before saving the file, click Tools menu 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.