Not sure if this issue got resolved for you yet or not. From what I gather from your post this is more of an Acrobat question and you should consider posting the question on the Acrobat Forum. In any case there isn't enough information about what you are trying to do in your message for me to help you out. In general I can say that email should not be considered secure on its own and you should consider adding passwords to PDF files when sending information that is sensitive. Again this isn't really a Formscentral question as far as I can tell.