Licence Protector 5

.NET offers a Strong-Name signing. This prevents spoofing of your code because the framework checks during loading if the assembly was modified.

This is just an additional option you could use to add one more security feature but it does not replace the other anti hacker strategies.

For more details how to use strong-name signing see this article:

http://msdn.microsoft.com/msdnmag/issues/06/07/CLRInsideOut/default.aspx