To view data in a password-protected drawing, you open the drawing in a standard way and enter the password. Passwords are not case-sensitive.
Unless a drawing's properties, such as the title, author, subject, and keywords, were encrypted when the password was attached, you can view the properties in Properties dialog box in Microsoft ® Windows Explorer.
A password-protected drawing may contain external references (xrefs) to password-protected drawings. If you open a password-protected drawing that contains xrefs, you must enter a password for any xref whose password is different from the current drawing's password.
A drawing and its external references remain password-protected until the passwords are removed. You generally should remove passwords before performing batch operations on files, unless you are signing files.