Welcome to the forums ranajit. Are you looking for a tutorial to remove protection from a vcd, or are you trying to apply protection to one? If you are trying to put the protection on, I’m afraid you are out of luck, as there are no protection schemes I know of that can be applied by an individual that would be effective.
Removal of protection might be possible depending on what has been done. We see very, very few vcd’s anymore, since that format has been largely abandoned for the past 5 yrs or more. If nothing else works, you could probably make a copy using Tunebite.