AutoCAD 2008 User's
Guide > Work with Other
People and Organizations > Protect and Sign
Drawings > Drawing
Encryption >
Protect Drawings with Encryption
If you add a password to a drawing and save the drawing, the drawing is encrypted and cannot be reopened until the password is entered.
You can attach a password to a file while modifying the file or when you save the file. You must individually add a password to each drawing you want to encrypt.
A password can be a single word, or a phrase. It is recommended that you use common characters. The more characters you use, the harder it is for an unauthorized program, or “password cracker,” to determine the password.
You can choose an advanced encryption level to protect your drawing.
