Procedure for encrypting PDF files (classic)
Set a document password to protect and encrypt a PDF file. A document password cannot be the same as the master password.
Only users who have the password can open and decrypt the PDF file.
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Encryption is possible only for scan files that are sent by e-mail or Scan to Folder and saved on a memory storage device.
You cannot open an encrypted file without a document password. Make sure you do not forget the file's password.
Press [Send File Type / Name].

Press [PDF].
If necessary, select [High Compression PDF].
Press [Security Settings].
Make sure that the [Encryption] tab is selected.
In [Encrypt Document], press [On].
Press [Enter].
Enter a password, and then press [OK].
Document passwords can contain up to 32 characters.
The password entered here will be required to open the PDF file.
Enter the password again to confirm it, and then press [OK].
In [Encryption Level], select [40 bit RC4], [128 bit RC4], [128 bit AES] or [256 bit AES].
Press [OK] twice.
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If [Low Resolution Only] is selected as the print permission, you cannot select [40 bit RC4] as the PDF encryption level.