XLS Padlock is software for Microsoft Excel to copy-protect Excel workbooks. It works as a compiler that allows you to turn Excel worksheets into secured applications.
Protect your Excel files with dongle protection or with hardware-locked activation keys only working on a given computer.
Safely distribute your files, control which user can access your Excel worksheets and prevent copying of spreadsheets.
All Excel functionalities are supported.
Website: http://www.xlspadlock.com