serious help needed for a major noob :)

hi guys i recently borrowed a copied dvd of a friend and tried to copy it to my computer but for sum reason it came up with this message "cannot copy VTS_01_1.VOB data error (cyclic redundancy check. i have watched the dvd and it work just fine but for sum reason i cant copy anything this guys lends to me, all other copy's i borrow and do this with it works just fine. does any1 have any idea????????

 

Yeah....tried to rip a copy of a copy......yeah. That message might pop up trying to copy movies you don't own.