Canon mp620 - Manual (Page 447)

The following images can be compressed with high efficiency.
- Images with resolutions within the range of 75 dpi to 600 dpi
Security
Set passwords for opening, editing and printing the created PDF files.
Important
Internet Explorer 5.5 Service Pack 2 or later is required to use this function.
This function is not available when images are automatically saved after scanning, such as when
scanning from the One-click Mode screen or scanning using the Operation Panel of the machine.
Note
Select Password Security and set passwords in the Password Security -Settings dialog box.
Setting Passwords for PDF Files
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Page 447 of 815 pages PDF Settings Dialog Box