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How-To Restrict Access to Microsoft Office Documents
Authors can restrict permission for documents, workbooks, and presentations on a per-user, or per-file.
Step 1. Go to File > Protect Document > Restrict Access > Restricted Access. The Permission window will open.
Step 2. Make sure the Restrict Permission to this document box is selected. Enter the email addresses of individuals who can Read or Change the document. Click “OK” when finished.