Document Inspector
Whenever you create or edit a document, certain personal information may be added to the file automatically—for example, information about the document's author. You can use Document Inspector to remove this type of information before sharing a document with others.
Because some changes may be permanent, it's a good idea to use Save As to create a backup copy of your document before using Document Inspector.
To use Document Inspector:
Click the File tab to go to Backstage view.
From the Info pane, click Check for Issues, then select Inspect Document from the drop-down menu.
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Document Inspector will appear. Check or uncheck the boxes, depending on the content you want to review, then click Inspect. In our example, we'll leave everything selected.
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The inspection results will show an exclamation mark for any categories where it found potentially sensitive data, and it will also have a Remove All button for each of these categories. Click Remove
All to remove the data.
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When you're done, click Close.