Parallel importing of "free-to-view" Sky cards from the UK to Ireland is often done so that Irish Sky customers can receive Channel 5 and some of the other channels not generally available via Sky in the Republic because of trademark and other licensing issues. Conversely, Sky viewing cards from the Republic of Ireland, which allow viewing of Irish terrestrial channels, are imported into the UK. Northern Ireland residents subscribing to Sky can watch RTÉ One and Two and TG4, although not TV3, which carries many of the same programs as ITV, a lot of the programs airing before ITV can show them.