How To Delete A "Read Only" File On A DVD

Hey all,

I bought a bootleg copy of Rosetta Stone Spanish from Dh Gate. The seller told me something that wasn't true (big surpirse) and when I got the program DVD there was a "crack" folder on it. The crack folder is not needed unless you want to register the software which I don't want to do. I just want to delete that folder. Anyone know how to do that or if there is software that can do it?

Thanks