The Creator output profiles have a section titled "Security" where a password can be entered. Generally speaking, entering a password in a field and then saving the profile is not really appealing. Moreover, I have a scenario in which the passwords are different each time a PDF is generated.
Suggestion: if the "use security settings" checkbox is ticked and the password field is empty, then present a prompt asking for the password during the conversion process. Maybe similar approach for the "Information" section, to be able on the fly to enter some data per document. Or have a second checkbox "interactively require...".