Hey, thanks for the reply.... Background: I am a co-founder of Tenacious C (www.tenaciousc.com), and we are developing a tool that presents the internals of C programming for educational and industry purpose....moving to C++ soon. Anyway, we do want to make it a paid app; therefore, we do want to protect it. To what extent? That's what we are contemplating. I was hoping to get some good/generous feedback on this site because I trust this site and the people on it.