Canon PIXMA MX870 - Manual (Page 549)

The Password Security -Settings dialog box opens.
Note
You can also open the Password Security -Settings dialog box by clicking Set..., then selecting
Password Security for Security in the PDF Settings dialog box.
3. Select the Require a password to open the document or Use a password to restrict
printing and editing of the document and its security settings checkbox, then enter a
password.
Important
Up to 32 single-byte alphanumeric characters can be used for the password. Passwords are
case sensitive.
Select both checkboxes to set both Document Open Password and Permissions Password.
You cannot use the same password for both.
4. Click OK.
The Confirm Document Open Password or Confirm Permissions Password dialog box opens.
Page 549 of 1127 pages Setting Passwords for PDF Files