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# Encrypting PDF files

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Set a document password to protect and encrypt a PDF file. Only users who have the password can open and decrypt the PDF file.

- Encryption is possible only for scan files that are sent by e-mail or Scan to Folder and saved on a removable memory 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].

Check that [PDF] or [High Compression PDF] is selected.

Press [Security Settings].

Select [Encryption].

In [Document Password], press [On].

Enter a password, and then press [OK].

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.

- A document password cannot be the same as the master password.

- Document passwords can contain up to 32 alphanumeric characters.

- You cannot use Adobe Acrobat Reader 3.0 or 4.0 to view PDF files that were created using [128 bit RC4] encryption.

- PDF files created using [128 bit AES] encryption can be viewed only with Adobe Reader 7.0 or later.

- PDF files created using [256 bit AES] encryption can be viewed only with Adobe Reader 9.0 or later.

- If [Low Resolution Only] is selected as the print permission, you cannot select [40 bit RC4] as the PDF encryption level.

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