how to create a workbook with read-protected-password

[冯如超]

To All,
 
Excuse me, I need to create a workbook with read-protected-password so that 
others cannot read it.
 
Now in POI thers is a method(writeProtectedPassword) that can create a write 
protected workbook.. However,I do not know how to create a workbook with 
read-protected-password. 
 
IF anyone knows, would you please mail back to me?
 
Thanks a lot.