unmarkedhelicopter,
While I do agree with your misgivings about discussing how to break passwords, I want to point out, for everyone's sake:
I really, really, really do *hope* that this isn't the only security you have for your protected document.
Seriously, the password protection is nothing more than a tiny padlock. Heck, you don't need a steel cutter for the job; a lowly crowbar would be enough to break the password. The way it's implemented, there's several ways to break it.
The only sensible use of protecting is to ensure users do not mess with the document template and enter data in specified fields. But that's a non-security reason, and requiring password is at least an annoyance (I regularly flip between protected mode and unprotected mode), and at worse, totally useless.
So, yeah, anyway, don't use protection for security purposes.