Since you're using formfields, you'll need to apply Word's 'filling in forms' protection, which can take a password. If you do that, your spell-check macro will need access to that so the form can be unprotected for spell-checking purposes. You can add the forms protection password to the code so no-one needs to have access to it to run your spell-check macro. Your VBA project, too, can be password protected so no-one else can open that to view the password used for the forms protection.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]