How to unprotect Word formular?

Situation, I can open, read, fill the formular and save document at wish even edit associated macros. The problem is how to unlock the document for editing without knowing the lock password. The method which I use was saving as RTF, open copy macros, save. The problem is now I got several documents to ?unprotect?, I do not want to doing described procedure. It will take to much time. So, how to unlock the document in some automatically method?