Password Protection turns on the password prompt for SuperEncryptor. After you enable this feature, you will be prompted for a password every time you run SuperEncryptor. Using a password to protect SuperEncryptor prevents others from using or uninstalling SuperEncryptor to bypass your protections.
To enforce password protection of SuperEncryptor, you must also set up a password using Tools > Change Password, otherwise this selection is turned off when you close SuperEncryptor. It is strongly suggested setting up a password for the safety concern!