Getting a RAP file using ps3xport

the guide says "It is also possible to dump digital content and licenses onanyPS3 even without custom firmware, by the way of creating a system backup, and then extracting it with ps3xport software."  however is there a guide anywhere to this process.  I am trying to do this for the Japanese version of code veronica.  finding a rap file for the english version was easy but seems impossible for the japanese version so i am trying to do it myself.  

I don't have custom firmware but if i can do it without that would be great.  On the files I extraced when i go to the exdata folder there is nothing in it