To encrypt your file and set a password to open it:
- Click the Microsoft Office Button , point to Prepare, and then click Encrypt Document.
 
- In the Encrypt Document dialog box, in the Password box, type a password, and then click OK.
 
You
 can type up to 255 characters. By default, this feature uses AES 
128-bit advanced encryption. Encryption is a standard method used to 
help make your file more secure.
- In the Confirm Password dialog box, in the Reenter password box, type the password again, and then click OK.
 - To save the password, save the file.
 
Remove password protection from a Word document
- Use the password to open the document.
 - Click the Microsoft Office Button , point to Prepare, and then clickEncrypt Document.
 - In the Encrypt Document dialog box, in the Password box, delete the encrypted password, and then click OK.
 - Save the file.
 
Set a password to modify a Word document
In addition to setting a password to open a Word document, you can set a password to allow others to modify the document.
- Click the Microsoft Office Button , click Save As, and on the bottom of the Save As dialog, click Tools.
 - On the Tools menu, click General Options. The General Options dialog opens.
 - Under File sharing options for this document, in the Password to modifybox, type a password.
 - In the Confirm Password dialog, re-type the password. Click OK.
 - Click Save.
 
 NOTE   To remove the password, repeat these instructions and then delete the password from the Password to modify box. Click Save.
   
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