How to put a password on a MS Office document?

To encode a file and set a password to get access to it You’ll have to do the following:

1. Click the Microsoft Office button, choose the Prepare command and then click the Encrypt Document command.
2. In the Document Encryption dialogue box in the Password gap (max. 255 characters), enter the password and then click OK.
3. In the Password Confirmation dialogue box, rewrite the password in the Re-enter the password gap, then click OK.

4. To save the password, save the file.

See also: How to sell Your MS Office document?