If you want users to be able to edit the text of Word documents but cannot change important information such as author names . recorded in the Header or Footer of the text, please follow this article.
You open the data file that created your Header and Footer .
Step 1: Place the cursor in the first line of the text. Click the Page Layout tab -> Break -> Continuous .
Step 2: Click the Review tab -> Restrict Editing .
Step 3: A dialog box appears -> check Allow only this type of editing in the document -> select Filling in forms .
Step 4: Integrate select the Select Sections -> uncheck the dialog box choose in Sections 2 -> OK .
Step 5: Click Yes, Start Enforcing Protection -> dialog box appears enter password -> OK .
You reopen this file and make sure you can only edit the content, not the Header and Footer.
Note: If after selecting the Header and Footer protection you want to edit them, click Stop Protection .
Good luck!