MS Office docs (MS Word, Excel, etc.) – To password protect a document in Office 2013 or Office 2010, click the File menu, click the Protect Document button in the Info section, and select Encrypt With Password. You’ll be prompted to enter a password, which you’ll have to provide each time you open the document in the future. (convey the password separately by phone or text, or in a separate email if necessary.) You can also fully decrypt the document in the future, removing the need for a password.
If that doesn’t work for you, you might check this out:
If you’re using a Professional or Enterprise edition of Windows, you also have access to some special encryption features. Home versions of Windows — and the standard edition of Windows 8, which technically isn’t named a “home” version — don’t have access to these features. Professional editions of Windows include the two encryption features (describes at this link).
Password protecting a PDF
If you have the full Adobe Acrobat program (not just the free Adobe Reader):
If you have a Word doc you want to turn into a PDF and then password protect it:
If you have a PDF (such as something you scanned) and need to password protect it, there are free online resources such as pdfprotect.net
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