I know a guy who's pioneering 'card sharing' services:
http://www.dream-multimedia-tv.co.uk/FAQ.htm
Basically, he sells you a pre-configured decoder that needs to be attached to a router, which decrypts satellite television channels on the fly. His setup can access DSTV signals and charges you (a certain amount) per month.
Be advised, it's illegal but it works (seen demonstration).