Thought i could copy protectet dvd with clone dvd but doesnt work

hi guys´n´girls
i´ve downloaded the sneak preview of clone-dvd to try to copy my protectet movie-dvd´s thinking it´s the right tool but it tells me immediatly that i can´t copy protectet dvd. so maybe somebody out there is willing to help and tell me what i have to do and what i need to do so. as you may see i´m an absolut beginner on computer matter.
thank´s and i´m waiting for replie.