Hi, Deyan, thanks for your reply.
I got another question. After purchasing the windows phone radcontrols, I downloaded those dll files, and used then in my project.
But I got a little confused with the license agreement. Cause when people unzip a xap file(after building the windows phone project), the Telerik.Windows.Controls.dll Telerik.Windows.dll, something like that, are so easy to be seen. People can just copy those dll file and apply them into their own project.
So I want to know how to abvoid this situation, I just want that even the dll files are copied, they wouldn't work.