How to unlock a Microsoft .docx document? – Super User
DocX is a compressed zip container file. Make a copy of the original docx file. If you unzip it, there is a subfolder named word with a file named settings.xml. You can open settings.xml with a plain text editor.Within that there is a block of text:
<w:documentProtection w:edit="" w:enforcement="1" w:cryptProviderType="" w:cryptAlgorithmClass="" w:cryptAlgorithmType="" w:cryptAlgorithmSid="" w:cryptSpinCount="" w:hash="" w:salt=""/>
You can either change w:enforcement value to 0 or remove the block
Source: How can I unlock a Microsoft .docx document? – Super User
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