A family of Microsoft word processing software products for creating web, email, and print documents.
Perhaps you're simply being deceived by a change in how the menu now works... In prior versions Protect Document contextually changed to Unprotect Document if Protection was active in the document. Word 2016 doesn't work that way - Protect Document is persistent.
In order to deactivate Protection either:
- Select Tools> Protect Document, then clear the check on Protect document for, or
- Click the Protect Form button on the Developer tab of the Ribbon.