If you don't want content reviewers to accidentally modify a file, you can make formatting and editing restrictions. One option is making the file a read-only file, which can be read or copied, but not modified. If someone attempts to make changes to a read-only file, the changes can be saved only by giving the file a new name.

1. On the Review tab, click Protect Document.
2. Select Restrict Formatting and Editing.
3. In Formatting restrictions, Editing restrictions and Start enforcement, you can make selections that meet your formatting and editing needs.

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