this dvd is copy-protected
clonedvd2 is not for use in copying protected dvds.
many dvds are content scrambling system (CSS) encoded, which is a copy-protected file system. if a dvd is CSS-encoded then dvd reader will refuse to access the disc. therefore clonedvd2 cannot read the files and make a copy.
if it is permitted to create backups in the country you live in, you use CSS decoding tools available on the internet.
you can check the legal situation in you country at? http://www.euro.copyrights.org