I have written a classic ASP application (VB and SQL Server database) and do not plan to convert the whole of it to ASP.NET. However, I would like to find a way to protect the application from being copied and re-sold - perhaps by re-writing certain key parts of it with compiled code.

Is this feasible? What would be the best parts to re-write? I realise that I could not protect all the code this way, but want a way to "lock down" the application for the specific client it is written for (so that it would be difficult for them to re-sell it).

Please can you help?

Thanks.