Protecting Excel work book using SpreadsheetGear in C#

What is best possible way t开发者_运维技巧o protect Excel work book(read only) and work sheets without using

password using SpreadsheetGear dll in c#?

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Setting IWorksheet.ProtectContents to true protects a worksheet without attaching a password to it.

SpreadsheetGear 2009 does not support workbook protection / passwords. SpreadsheetGear 2010 does support workbook protection with a new IWorkbook.Protect(...) method, and also supports reading and writing password protected workbooks. We intend to release SpreadsheetGear 2010 this summer.