itextsharp error

Question

hai every one,

The orginal pdf file doesn't allow to copy ,edit these types of permision  but when i am using 
Itextsharp 5.3.2 version this is working fine beacause in 5.3.2 version has one property is 


PdfReader.unethicalreading = true;
 

BUT the old version  of itextsharp dll it is not working because of there is no 
PdfReader.unethicalreading = true;
 


how can solve this problem in old versions