Now you can also protect Excel sheets without passwords and that too in a very simple process. Use eSoftTools Excel Password Recovery Software. In this software, users are also provided with the best methods with the help of which you can recover, remove, unlock, and break the password of any character such as numeric, alphabetic and symbolic. This software can be used by both technical and non-technical users. This software also provides free demos for all users.

More info- unprotect an Excel sheet without a password