Changing the PDF Encryption Level from Acrobat 10.0 or Equivalent to Acrobat 9.0 or Equivalent

You can select the encryption level from the following when generating encrypted PDF files:
Acrobat 3.0 or Later/40-bit RC4
Acrobat 6.0 or Later/128-bit RC4
Acrobat 7.0 or Later/128-bit AES
Acrobat 10.0 or Equivalent/256-bit AES
If you want to select [Acrobat 9.0 or Equivalent/256-bit AES] rather than [Acrobat 10.0 or Equivalent/256-bit AES], you can change the select item by following the procedures below.
Default Setting
[Acrobat 9.0 or Equivalent] is specified
For information on the optional products required to use this function, see "Optional Products Required for Each Function."
For more information on encrypted PDF files, see "Encrypting PDF Files" in "Scan and Send" and "Encrypting PDF Files" in "Scan and Store."

Press (Settings/Registration).
Press [Function Settings] → [Common] → [Generate File].
Press [256-bit AES Settings for Encrypted PDF].
Select [Acrobat 9.0 or Equivalent] → press [OK].
If you select [Acrobat 10.0 or Equivalent], [Acrobat 10.0 or Equivalent/256-bit AES] is displayed when selecting the encryption level.