Fujitsu ScanSnap S500 Operator's Manual page 132

3. Select the checkbox for "Set a password for PDF file" on "PDF File Option."
To enter a password for every scan
Clear the checkbox for "Use a fixed password."
To use a fixed password decided in advance
1) Select the checkbox for "Use a fixed password."
2) Enter the same password for "Password" and "Confirm."
HINT
4. Click the [OK] button to close all the screens.
5. Load the document onto the scanner.
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⇒ You can enter a different password for every scan.
⇒ The same password is used for all PDF files.
There is no need to enter a password for every scan.
You can use the following characters to set your password.
Maxium number of characters: 16
Characters: A-Z, a-z, 0-9
Symbols: ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~