Microsoft Excel is a popular software for managing data in organizations. It is mainly due to its advanced data manipulation and representation features. In this technological age, documents are shared virtually instead of printed copies. These files may contain complex and sensitive data. So to maintain such files’ integrity, you might need to guard them against modification. Excel’s protection features come in handy for this purpose. In this article, you will learn how to protect and unprotect Excel files programmatically using C++.