software copy protection

I am looking to add software copy protection to my software app. Any recommendations.

Quite a broad question. There may be numerous ways. What exactly do you want to protect? Do you have a licensing system?

Another question is what language are you using, and what IDE ?? ...

There are a few options here on CG for VB6 and vb.net, that utilize product keys...

Some links for your reference, they are not exactly what you are looking for, but will give you fair idea about what you want to achieve...

Thread: How do you build a 30-day trial app?
Thread: Create Trial Version of an appliation
Thread: Creating a Trial period for software
CExpire - A C++ class that implements time and run based restrictions

Eish, when a person gets old....... ( talking about me here )

You could have a look at my article ( which I forgot about ) as well - it might give you some ideas too :

Protecting Visual Basic .NET Source Code and Applications
http://www.codeguru.com/csharp/.net/...le.php/c11817/