Microsoft® Excel® Spreadsheet Protection Solution
Add protection to Excel and OpenOffice™ spreadsheets with free cross-platform Apps and APIs
Free Online App for Excel Protection
Protect Excel XLS, XLSX & ODS spreadsheets with password
High Code APIs to Password Protect Spreadsheet
Native APIs to protect Excel & OpenOffice spreadsheets using .NET Core, Xamarin, Java, C++, Android, Node.js, PHP & Python