You can find libdvdcss2 and libdvdcss at atrpms. You need to install libdvdcss2 first.
Open a terminal type:
# rpm -Uvh http://dl.atrpms.net/f20-x86_64/atrpms/stable/libdvdcss2-1.2.13-7.fc20.x86_64.rpm
# rpm -Uvh http://dl.atrpms.net/f20-x86_64/atrpms/stable/ libdvdcss-1.2.13-7.fc20.x86_64.rpm
