first, if u try to decrypt a DVD from a frien or a rented DVD, u will be prosecuted, we will track you with you IP and we will send you to jail for the rest of your life.
OK, now, if you think u are "legal", download DVD decrypter, select file copy, then let decryper do his work.
then download DVD shrink, use reauthor, drag main movie to the left side of the screen.click on compression parameter, and chose the language u want keep. then do a save...and follow the instruction.
u can write directly clicking on nero box, or DVD decripter, (both solution will write the DVD after the shrink), or do a ISO image on ur HDD. the reopen dvd decrypter and change to ISO write...put a DVD blank disc, and u are done...
just play around with these 2 softwares, and u will be fine.
hope this help