Similar situation with Sky. Apart from the FTA channels, it is not available outside UK and RoI - in theory. This is not so much Sky's restriction but their fulfilent of an obligation not to broadcast material outsde the area for which it is licensed. So if you use it outside, you have to go through the farce of using a UK address, not letting them know that you're outside the UK if you phone them etc.
I don't know what percentage of their viewers is outside the UK but I suspect it must be high - just about every English speaking family I know in Europe within their reception footprint (which with a 1m. dish stretches into central Europe and well into Spain and Italy) has Sky.
Sky is strange in some respects. I live in RoI, and have (legal) Sky. BBC channels are available via EPG, so presumably the BBC have authorised content distribution with no restrictions. Channel 4 and subsiuary channels are also in the main list, although for some programmes you get a blank screen saying that the programme is not available (usually US imported shows). I can also (via freely available information) add ITV regional channels and Channel 5. These are not blocked by the viewing card, so presumably ITV are happy. Yet I not view BBC / ITV players here in the RoI. I belive they can also be seen on free to view satellite - certainly a holiday home I rented in Donegal could see UK television on the free satellite box a few year ago - along with some channels I had to be careful my kids didn't select
The reverse situation re RTE is the opposite. UK viewing cards cannot pick up RTE (even via the add channels menu), but RTE player and live viewing IS available via the internet - although the ad breaks are blocked. I believe Sky asked RTE for stupid money to add to the UK cards. Hence the large black market in Irish boxes and viewing cards with the diaspora in the UK.
MD