As libdvdcss2 is a simple library depending on libc6 and libgcc with no dCore repo specific dependencies, the build for Ubuntu Raring has been tested now to work with dCore-wheezy and dCore-zesty, the oldest and newest of the dCores. And should work with the dCore ports in between. Below is the /opt/debextra entry:
http://download.videolan.org/pub/debian raring