I have developed an application.I want to sell this application through pen drive.It is .net based application.No data will be installed on the user's hard disk.I want this application to run from the USB pen drive.is there any way to protect the pen drive from copying? so that use can not copy the whole pend drive.I know that this is possible because i have seen that many companies are selling product this way. Thank you in advance.If there is any other way to sell application please let me know.I just don't want piracy.

It would be a good idea to have a website for registering your software.

You can add the software activation as a step of software installation process and ask the user to enter to the web based verification method.

Once the request come to the website, you should collect the MAC address of the computer and store it in a database.