Is there any way for the form to prompt the user to upgrade?  In otherwords, can the form determine which version of reader is being used and notify the user that the form cannot be used in their current version and they need to upgrade.  Is this possible?Thank you!

Yes, but I am designing a form for an organization of people who won't or won't know how to update (as easy as it is) and will just give up.  So I am trying to make it as easy as possible.  Thanks for the help.

Could you tell me where I could learn more about these three options?  Which one requires the user of the form to do the absolute least amount of extra work?Brad

This is precisely what I would like to do, but cannot use a form with a submit button because my users are using all versions of Reader.  Can you either explain in more detail how I can do this or point me towards resources to learn how?You said, "The only secure way to do this is to encrypt the for...