Add authentication code to dot net project

Current Dot Net 3.5 application calls licensing server via? Dot Net? remoting to verify license exists every time the application starts. This means the application can't? receive? a license if there's no Internet connection. License is presently stored in memory, and is wiped out when the application closes. Need to modify this so that licensing occurs just once... so that the PC can be disconnected from the Internet and the application can still function.