>Is there a way to give a user a copy of ClassLibrary (*.vcx) files without allowing them access to to the code inside?

They can also reFox the Object Code in the VCX, even if you remove the source like Sergey suggested.

Other options, are to compile your VCX as COM object, or compile it as in an EXE or APP, then your user will just have to use the third paramter of NewObject().