How to set workbook with a read protect password to prevent others read it?

[冯如超]

Excuse me,
 
There is a methd  writeProtectedPassword that to prevent others to modify the 
workbook without a right password, however, others could
read the context of the workbook. 
 
How to create a workbook with a read protect password? This is a problem that 
troubles me a long time.
 
If anyone knows, would you please tell me with a simple sample?
 
Thank you very much.
 
Frank