Level 5
Microsoft Word and Powerpoint allow files to be password protected.

Does anyone know how secure this protection is ?

I was thinking of uploading some Word documents to the cloud and thought password protection could be a way of securing some documents.
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Level 7
I wouldn't count on it being secure. You're better off using something that's been proven to be secure such as VeraCrypt or Cryptomator, the easier of the two being Cryptomator.
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Level 24
Content Creator
The protection is not secure at all. There are number of programs which will recover passwords from protected office documents. Just do a Google search for office password recovery, for some examples.

This is handy if you ever forget your passwords, but not so good for restricting access for others.