Restrict access to documents with Information Rights Management in Word
https://prod.support.services.microsoft.com/en-us/office/restrict-access-to-documents-with-information-rights-management-in-word-94aa8ab1-465e-42d7-a323-d61f911b2d0f
Web ResultSelect the File tab. On the Info tab, select Protect Document, point to Restrict Permission by People, and then select Manage Credentials. Do one of the following: In the Select User dialog box, select the e-mail address for the account that you want to use, and then select OK.
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