ms word - Add a password to Office documents through C++ -

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I'm trying to add a password to an office with C ++, using "Office C ++ Office Automation ", but thought it was not what I see. I do not seem to understand how to do this, any help would be appreciated, thanks.

VBA (Visual Basic for Applications) is built in words that it would be easy to use an external Instead of using Office Automation from the C ++ program,

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