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Go to File > Info > Protect Document > Encrypt with Password. Type a password, press OK , type it again and press OK to confirm it. Save the file to make sure the password takes effect.
Removing a password from a document is a simple process, but you have to know the original password. Open the document and enter its password. Go to File > Info > Protect Document > Encrypt with Password .
In the box that opens, type a password you’ll be able to remember, and then type the password again to confirm it. The password’s optional. But if you don’t add a password, anyone can click Stop Protection and edit the document.
Use Restrict Editing to protect parts that can or can't be changed, who can make changes, find areas you can edit, or unlock a protected document.
If your organization uses Microsoft Purview Information Protection, they probably want you to apply that same protection to any PDFs you create from Microsoft 365 files. Here's how to do it using a Windows PC.
To help protect your computer, files from these potentially unsafe locations are opened as read only or in Protected View. By using Protected View, you can read a file, see its contents and enable editing while reducing the risks.
Select Info, choose Protect Document, point to Restrict Permission by People, and then select Restricted Access.
Encrypt documents with a password. Open the document that you want to password protect.
To co-author on documents where Information Rights Management is applied using Microsoft Purview Information Protection Sensitivity labels, you will need to contact your admin to Enable co-authoring for encrypted documents. See Microsoft Purview (compliance) (docs.com).
Under Permissions, view the list of tasks that you can perform with the file. Under Restrictions, view the list of tasks that you cannot perform with the file.