We have developed .net based licensing solution that can be used by software developers to integrate in their software. It can also be integrated in web based application to control the licensing of its usage and copy protection. Software vendors / companies can define licensing options to provide demo version ( or trial version , evaluation version ) to the users. After the completion of the defined period or number of runs, the software gets locked and user can unlock the software by requesting the license key. The big advantage of this solution is that users dont have to send the machine code via email or any other methods, it can be done online. The software user can click on register button, which will take the user to the software vendor's website and after making payment the license key is generated on the fly and it will register the software on client's machine. In this whole process software vendor does not have to do anything and it become seamless online license providing solution. The web based interface allows the software vendor to view online how many licenses are sold, etc.