Absolute newbie..problems with cppm

Hello . First I would like to introduce myself as an absolute newbie.
I have just started making backups of dvd videos and transforming them into
avi files. I have had no problems with this until now.
I bought a dvd video that i wanted to compress into a avi, but this time the decrypter programs are stopping at 27%. The log gives the info that it is encrypted with css and cppm.
I have been searching various forums about this cppm. but i dont find any solution… at least not for newbies.
Please can anyone explain to me what its all about and how I can pass this encryption…

What programs are you using, and what disk are you trying to back up. DVD decrypter is generally excellent. There’s also AnyDVD which i think you can get a trial version of.