1)We have developed a library to use it with our software & we build it as DLL 2)We developed  a application using our library   Now what I need  that no other user can use my library in his application for example  when i give my application to end user that library is going to be added in setup, and if we dont protect it , any user can use it as reference in a .net project and can use my library and develop his own program , I need some thing that only my application will have access to my library and no other program can use it as reference and access its features