MythTV Box - Encrypted Channels

I'm thinking of building a MythTV Box. MythTV is Linux based PVR software. The idea is take an old PC, install a distribution of linux and then install MythTV. I will then add a terabyte hard-drive. It will then act as a dedicated PVR / media player / media server / dvd player etc.

I would then like to install a DVB-T or DVB-C tuner card. Is there software that will allow me to decrypt the premium channels on ch0ru$. Otherwise it would be a bit pointless setting up such a system

I have used a DVB-T tuner on windows and used ProgDVB to decrypt the channels, but I have little experience doing this on linux?

Thanks