In Europe some satellite TV services are encrypted since they have only been authorised by content suppliers to broadcast films, sporting events and US entertainment programming in a certain country or countries, hence only residents of the UK and Ireland may subscribe to Sky Digital. In other European countries with large British expatriate populations, such as Spain, Sky is widely available through the grey market. Although Sky discourages the use of its viewing cards outside the UK or Ireland, and has the technology to render them invalid, many people continue to use them.