Gustavo,

Make a copy of the VCX and VCT files. Then;

COMPILE CLASSLIB TheNameOfTheLib
USE TheNameofTheLib.vcx EXCLUSIVE
REPLACE ALL Methods WITH ""
USE

This will remove all source code from the VCX. If anyone tries to edit a method in this vcx then all of the calsses in it will stop working as there is no source code to be compiled.